inventory control

AGENTS.md

@@ -16,6 +16,7 @@ MRP Codex is a modular Manufacturing Resource Planning platform intended to be a
 - filesystem-backed attachments
 - CRM customers/vendors, hierarchy, contacts, lifecycle metadata, and attachments
 - inventory items, BOMs, warehouses, locations, transactions, item attachments, and item pricing
+- inventory transfers, reservations, available-stock visibility, and work-order reservation automation
 - sales quotes, sales orders, approvals, revision history, and purchase orders
 - purchase-order supporting documents and vendor-side purchasing visibility
 - shipping shipments, packing-slip PDFs, shipping labels, bills of lading, and logistics attachments
@@ -118,9 +119,8 @@ If implementation changes invalidate those docs, update them in the same change
 
 Near-term priorities are:
 
-1. Inventory transfers, reservations, and deeper stock controls
+1. Broader audit-trail coverage and operational diagnostics
-2. Broader audit-trail coverage and operational diagnostics
+2. Code-splitting and bundle-size reduction
-3. Code-splitting and bundle-size reduction
 
 When adding new modules, preserve the ability to extend the system without refactoring the existing app shell.
 

CHANGELOG.md

@@ -6,6 +6,9 @@ This file is the running release and change log for MRP Codex. Keep it updated w
 
 ### Added
 
+- Inventory transfers with paired physical stock movement posting between warehouses and locations
+- Manual inventory reservations plus automatic work-order-driven component reservations
+- Reserved and available stock visibility on inventory item detail and stock-by-location views
 - Manufacturing stations with queue-day definitions and item-level station/time operation templates
 - Automatic work-order operation plans copied from buildable item routing into planning/gantt
 - Live planning gantt timelines backed by active projects and open manufacturing work orders
@@ -27,13 +30,14 @@ This file is the running release and change log for MRP Codex. Keep it updated w
 - The dashboard now treats Projects as a live first-class module alongside CRM, inventory, sales, and shipping
 - The dashboard now treats Manufacturing as a live first-class module alongside CRM, inventory, sales, shipping, and projects
 - The dashboard now treats Planning as a live first-class module with direct gantt access from the landing page
+- Inventory control now distinguishes on-hand, reserved, and available stock instead of treating all positive stock as fully free
 - Manufacturing and inventory now share a routing-driven workflow where assemblies/manufactured parts define station/time templates and work orders inherit them automatically
 - Sales quote and sales-order detail pages now surface approval state and revision history directly in the operational workflow
 - Project editing now uses searchable pickers for customer, owner, quote, sales-order, and shipment linkage instead of static operational dropdowns
 - Project detail now surfaces linked work orders and can launch pre-seeded manufacturing records
 - Purchase-order detail now links back to the vendor CRM record and supports direct supporting-document management on the PO itself
 - Vendor CRM detail now exposes purchasing activity and can launch pre-seeded purchase orders
-- Roadmap and project docs now treat inventory transfers and deeper stock controls as the next active priority after the planning slice
+- Roadmap and project docs now treat broader audit-trail coverage and operational diagnostics as the next active priority after the inventory-control slice
 
 ## 2026-03-15
 

INSTRUCTIONS.md

@@ -15,6 +15,7 @@ This repository implements the platform foundation milestone:
 - file attachment storage
 - CRM foundation through reseller hierarchy, contacts, attachments, and lifecycle metadata
 - inventory master data, BOM, warehouse, stock-location, transactions, and item attachments
+- inventory transfers, reservations, available-stock visibility, and work-order reservation automation
 - sales quotes and sales orders with quick actions and quote conversion
 - sales approvals, approval stamps, and automatic revision history on quotes and sales orders
 - purchase orders with quick actions and searchable vendor/SKU entry
@@ -61,6 +62,5 @@ This repository implements the platform foundation milestone:
 
 ## Next roadmap candidates
 
-- inventory transfers, reservations, and deeper stock controls
 - broader audit and operations maturity
 - code-splitting and bundle-size reduction

README.md

@@ -15,6 +15,7 @@ Current foundation scope includes:
 - CRM search, filtering, status tagging, and reseller hierarchy
 - CRM contact history, account contacts, and shared attachments
 - inventory item master, BOM, warehouse, stock-location, and stock-transaction flows
+- inventory transfers, reservations, and available-stock visibility
 - sales quotes and sales orders with searchable customer and SKU entry
 - sales approvals, approval stamps, and automatic revision history on quotes and sales orders
 - purchase orders with searchable vendor and SKU entry, restricted to purchasable inventory items
@@ -43,9 +44,8 @@ Current completed foundation areas:
 
 Near-term priorities:
 
-1. Inventory transfers, reservations, and deeper stock controls
+1. Broader audit-trail coverage and operational diagnostics
-2. Broader audit-trail coverage and operational diagnostics
+2. Code-splitting and bundle-size reduction
-3. Code-splitting and bundle-size reduction
 
 Revisit / deferred items:
 
@@ -206,15 +206,16 @@ The current inventory foundation supports:
 - protected warehouse list, detail, create, and edit flows
 - nested stock-location management inside each warehouse record
 - inventory transaction posting for receipts, issues, and adjustments
+- inventory transfers with paired source/destination movement posting
+- manual reservations plus automatic work-order component reservations
 - item on-hand quantity, stock-by-location balances, and recent stock history
+- reserved and available quantity visibility by location
 - item-level file attachments for drawings and support documents
 - seeded sample inventory items and a starter assembly BOM during bootstrap
 - seeded sample warehouse and stock locations during bootstrap
 
 QOL direction:
 
-- stock transfers
-- reservations and allocations
 - clearer warehouse dashboards and shortage views
 - BOM revisions and where-used visibility
 

ROADMAP.md

@@ -32,6 +32,7 @@ MRP Codex is being built as a streamlined, modular manufacturing resource planni
 - CRM multi-contact records, commercial terms, lifecycle stages, operational flags, and activity rollups
 - Inventory item master, BOM, warehouse, and stock-location foundation
 - Inventory transactions, on-hand tracking, and item attachments
+- Inventory transfers, reservations, available-stock visibility, and work-order-driven material reservation automation
 - Sales quotes and sales orders with commercial totals logic
 - Purchase orders with vendor lookup, item lines, totals, and quick status actions
 - Purchase-order line selection restricted to inventory items flagged as purchasable
@@ -282,6 +283,5 @@ QOL subfeatures:
 
 ## Near-term priority order
 
-1. Inventory transfers, reservations, and deeper stock controls
+1. Broader audit-trail coverage and operational diagnostics
-2. Broader audit-trail coverage and operational diagnostics
+2. Code-splitting and bundle-size reduction
-3. Code-splitting and bundle-size reduction

client/src/lib/api.ts

@@ -23,8 +23,10 @@ import type {
   InventoryItemDetailDto,
   InventoryItemInput,
   InventoryItemOptionDto,
+  InventoryReservationInput,
   InventoryItemStatus,
   InventoryItemSummaryDto,
+  InventoryTransferInput,
   InventoryTransactionInput,
   InventoryItemType,
   WarehouseDetailDto,
@@ -378,6 +380,26 @@ export const api = {
       token
     );
   },
+  createInventoryTransfer(token: string, itemId: string, payload: InventoryTransferInput) {
+    return request<InventoryItemDetailDto>(
+      `/api/v1/inventory/items/${itemId}/transfers`,
+      {
+        method: "POST",
+        body: JSON.stringify(payload),
+      },
+      token
+    );
+  },
+  createInventoryReservation(token: string, itemId: string, payload: InventoryReservationInput) {
+    return request<InventoryItemDetailDto>(
+      `/api/v1/inventory/items/${itemId}/reservations`,
+      {
+        method: "POST",
+        body: JSON.stringify(payload),
+      },
+      token
+    );
+  },
   getWarehouses(token: string) {
     return request<WarehouseSummaryDto[]>("/api/v1/inventory/warehouses", undefined, token);
   },

client/src/modules/inventory/InventoryDetailPage.tsx

@@ -1,4 +1,10 @@
-import type { InventoryItemDetailDto, InventoryTransactionInput, WarehouseLocationOptionDto } from "@mrp/shared/dist/inventory/types.js";
+import type {
+  InventoryItemDetailDto,
+  InventoryReservationInput,
+  InventoryTransactionInput,
+  InventoryTransferInput,
+  WarehouseLocationOptionDto,
+} from "@mrp/shared/dist/inventory/types.js";
 import { permissions } from "@mrp/shared";
 import { useEffect, useState } from "react";
 import { Link, useParams } from "react-router-dom";
@@ -11,14 +17,36 @@ import { InventoryStatusBadge } from "./InventoryStatusBadge";
 import { InventoryTransactionTypeBadge } from "./InventoryTransactionTypeBadge";
 import { InventoryTypeBadge } from "./InventoryTypeBadge";
 
+const emptyTransferInput: InventoryTransferInput = {
+  quantity: 1,
+  fromWarehouseId: "",
+  fromLocationId: "",
+  toWarehouseId: "",
+  toLocationId: "",
+  notes: "",
+};
+
+const emptyReservationInput: InventoryReservationInput = {
+  quantity: 1,
+  warehouseId: null,
+  locationId: null,
+  notes: "",
+};
+
 export function InventoryDetailPage() {
   const { token, user } = useAuth();
   const { itemId } = useParams();
   const [item, setItem] = useState<InventoryItemDetailDto | null>(null);
   const [locationOptions, setLocationOptions] = useState<WarehouseLocationOptionDto[]>([]);
   const [transactionForm, setTransactionForm] = useState<InventoryTransactionInput>(emptyInventoryTransactionInput);
+  const [transferForm, setTransferForm] = useState<InventoryTransferInput>(emptyTransferInput);
+  const [reservationForm, setReservationForm] = useState<InventoryReservationInput>(emptyReservationInput);
   const [transactionStatus, setTransactionStatus] = useState("Record receipts, issues, and adjustments against this item.");
+  const [transferStatus, setTransferStatus] = useState("Move physical stock between warehouses or locations without manual paired entries.");
+  const [reservationStatus, setReservationStatus] = useState("Reserve stock manually while active work orders reserve component demand automatically.");
   const [isSavingTransaction, setIsSavingTransaction] = useState(false);
+  const [isSavingTransfer, setIsSavingTransfer] = useState(false);
+  const [isSavingReservation, setIsSavingReservation] = useState(false);
   const [status, setStatus] = useState("Loading inventory item...");
 
   const canManage = user?.permissions.includes(permissions.inventoryWrite) ?? false;
@@ -43,20 +71,23 @@ export function InventoryDetailPage() {
       .getWarehouseLocationOptions(token)
       .then((options) => {
         setLocationOptions(options);
-        setTransactionForm((current) => {
+        const firstOption = options[0];
-          if (current.locationId) {
+        if (!firstOption) {
-            return current;
+          return;
-          }
+        }
 
-          const firstOption = options[0];
+        setTransactionForm((current) => ({
-          return firstOption
+          ...current,
-            ? {
+          warehouseId: current.warehouseId || firstOption.warehouseId,
-                ...current,
+          locationId: current.locationId || firstOption.locationId,
-                warehouseId: firstOption.warehouseId,
+        }));
-                locationId: firstOption.locationId,
+        setTransferForm((current) => ({
-              }
+          ...current,
-            : current;
+          fromWarehouseId: current.fromWarehouseId || firstOption.warehouseId,
-        });
+          fromLocationId: current.fromLocationId || firstOption.locationId,
+          toWarehouseId: current.toWarehouseId || firstOption.warehouseId,
+          toLocationId: current.toLocationId || firstOption.locationId,
+        }));
       })
       .catch(() => setLocationOptions([]));
   }, [itemId, token]);
@@ -65,6 +96,10 @@ export function InventoryDetailPage() {
     setTransactionForm((current) => ({ ...current, [key]: value }));
   }
 
+  function updateTransferField<Key extends keyof InventoryTransferInput>(key: Key, value: InventoryTransferInput[Key]) {
+    setTransferForm((current) => ({ ...current, [key]: value }));
+  }
+
   async function handleTransactionSubmit(event: React.FormEvent<HTMLFormElement>) {
     event.preventDefault();
     if (!token || !itemId) {
@@ -92,8 +127,51 @@ export function InventoryDetailPage() {
     }
   }
 
+  async function handleTransferSubmit(event: React.FormEvent<HTMLFormElement>) {
+    event.preventDefault();
+    if (!token || !itemId) {
+      return;
+    }
+
+    setIsSavingTransfer(true);
+    setTransferStatus("Saving transfer...");
+
+    try {
+      const nextItem = await api.createInventoryTransfer(token, itemId, transferForm);
+      setItem(nextItem);
+      setTransferStatus("Transfer recorded.");
+    } catch (error: unknown) {
+      const message = error instanceof ApiError ? error.message : "Unable to save transfer.";
+      setTransferStatus(message);
+    } finally {
+      setIsSavingTransfer(false);
+    }
+  }
+
+  async function handleReservationSubmit(event: React.FormEvent<HTMLFormElement>) {
+    event.preventDefault();
+    if (!token || !itemId) {
+      return;
+    }
+
+    setIsSavingReservation(true);
+    setReservationStatus("Saving reservation...");
+
+    try {
+      const nextItem = await api.createInventoryReservation(token, itemId, reservationForm);
+      setItem(nextItem);
+      setReservationStatus("Reservation recorded.");
+      setReservationForm((current) => ({ ...current, quantity: 1, notes: "" }));
+    } catch (error: unknown) {
+      const message = error instanceof ApiError ? error.message : "Unable to save reservation.";
+      setReservationStatus(message);
+    } finally {
+      setIsSavingReservation(false);
+    }
+  }
+
   if (!item) {
-  return <div className="rounded-[28px] border border-line/70 bg-surface/90 p-4 text-sm text-muted shadow-panel">{status}</div>;
+    return <div className="rounded-[28px] border border-line/70 bg-surface/90 p-4 text-sm text-muted shadow-panel">{status}</div>;
   }
 
   return (
@@ -111,7 +189,7 @@ export function InventoryDetailPage() {
             <p className="mt-3 text-sm text-muted">Last updated {new Date(item.updatedAt).toLocaleString()}.</p>
           </div>
           <div className="flex flex-wrap gap-3">
-          <Link to="/inventory/items" className="inline-flex items-center justify-center rounded-2xl border border-line/70 px-2 py-2 text-sm font-semibold text-text">
+            <Link to="/inventory/items" className="inline-flex items-center justify-center rounded-2xl border border-line/70 px-2 py-2 text-sm font-semibold text-text">
               Back to items
             </Link>
             {canManage ? (
@@ -122,11 +200,20 @@ export function InventoryDetailPage() {
           </div>
         </div>
       </div>
-      <section className="grid gap-3 xl:grid-cols-5">
+
+      <section className="grid gap-3 xl:grid-cols-7">
         <article className="rounded-[24px] border border-line/70 bg-surface/90 px-3 py-3 shadow-panel">
           <p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">On Hand</p>
           <div className="mt-2 text-base font-bold text-text">{item.onHandQuantity}</div>
         </article>
+        <article className="rounded-[24px] border border-line/70 bg-surface/90 px-3 py-3 shadow-panel">
+          <p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Reserved</p>
+          <div className="mt-2 text-base font-bold text-text">{item.reservedQuantity}</div>
+        </article>
+        <article className="rounded-[24px] border border-line/70 bg-surface/90 px-3 py-3 shadow-panel">
+          <p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Available</p>
+          <div className="mt-2 text-base font-bold text-text">{item.availableQuantity}</div>
+        </article>
         <article className="rounded-[24px] border border-line/70 bg-surface/90 px-3 py-3 shadow-panel">
           <p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Stock Locations</p>
           <div className="mt-2 text-base font-bold text-text">{item.stockBalances.length}</div>
@@ -136,14 +223,15 @@ export function InventoryDetailPage() {
           <div className="mt-2 text-base font-bold text-text">{item.recentTransactions.length}</div>
         </article>
         <article className="rounded-[24px] border border-line/70 bg-surface/90 px-3 py-3 shadow-panel">
-          <p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">BOM Lines</p>
+          <p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Transfers</p>
-          <div className="mt-2 text-base font-bold text-text">{item.bomLines.length}</div>
+          <div className="mt-2 text-base font-bold text-text">{item.transfers.length}</div>
         </article>
         <article className="rounded-[24px] border border-line/70 bg-surface/90 px-3 py-3 shadow-panel">
-          <p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Operations</p>
+          <p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Reservations</p>
-          <div className="mt-2 text-base font-bold text-text">{item.operations.length}</div>
+          <div className="mt-2 text-base font-bold text-text">{item.reservations.length}</div>
         </article>
       </section>
+
       <div className="grid gap-3 xl:grid-cols-[minmax(0,1.05fr)_minmax(340px,0.95fr)]">
         <article className="rounded-[28px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
           <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Item Definition</p>
@@ -173,128 +261,41 @@ export function InventoryDetailPage() {
           </dl>
         </article>
         <article className="rounded-[28px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
-          <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Internal Notes</p>
+          <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Stock By Location</p>
-          <p className="mt-3 whitespace-pre-line text-sm leading-6 text-text">{item.notes || "No internal notes recorded for this item yet."}</p>
+          {item.stockBalances.length === 0 ? (
-          <div className="mt-8 rounded-2xl border border-line/70 bg-page/70 px-2 py-2 text-sm text-muted">
+            <p className="mt-4 text-sm text-muted">No stock or reservation balances have been posted for this item yet.</p>
-            Created {new Date(item.createdAt).toLocaleDateString()}
-          </div>
-          <div className="mt-4 rounded-2xl border border-line/70 bg-page/70 px-2 py-2">
-            <p className="text-xs font-semibold uppercase tracking-[0.18em] text-muted">Current stock by location</p>
-            {item.stockBalances.length === 0 ? (
-              <p className="mt-2 text-sm text-muted">No stock has been posted for this item yet.</p>
-            ) : (
-              <div className="mt-3 space-y-2">
-                {item.stockBalances.map((balance) => (
-                  <div key={balance.locationId} className="flex items-center justify-between rounded-2xl border border-line/70 bg-surface px-2 py-2 text-sm">
-                    <div className="min-w-0">
-                      <div className="font-semibold text-text">
-                        {balance.warehouseCode} / {balance.locationCode}
-                      </div>
-                      <div className="text-xs text-muted">
-                        {balance.warehouseName} · {balance.locationName}
-                      </div>
-                    </div>
-                    <div className="shrink-0 font-semibold text-text">{balance.quantityOnHand}</div>
-                  </div>
-                ))}
-              </div>
-            )}
-          </div>
-        </article>
-      </div>
-      <section className="rounded-[28px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
-        <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Bill Of Materials</p>
-        <h4 className="mt-2 text-lg font-bold text-text">Component structure</h4>
-        {item.bomLines.length === 0 ? (
-          <div className="mt-6 rounded-3xl border border-dashed border-line/70 bg-page/60 px-4 py-8 text-center text-sm text-muted">
-            No BOM lines are defined for this item yet.
-          </div>
-        ) : (
-          <div className="mt-6 overflow-hidden rounded-2xl border border-line/70">
-            <table className="min-w-full divide-y divide-line/70 text-sm">
-              <thead className="bg-page/80 text-left text-muted">
-                <tr>
-                  <th className="px-2 py-2">Position</th>
-                  <th className="px-2 py-2">Component</th>
-                  <th className="px-2 py-2">Quantity</th>
-                  <th className="px-2 py-2">UOM</th>
-                  <th className="px-2 py-2">Notes</th>
-                </tr>
-              </thead>
-              <tbody className="divide-y divide-line/70 bg-surface">
-                {item.bomLines.map((line) => (
-                  <tr key={line.id}>
-                    <td className="px-2 py-2 text-muted">{line.position}</td>
-                    <td className="px-2 py-2">
-                      <div className="font-semibold text-text">{line.componentSku}</div>
-                      <div className="mt-1 text-xs text-muted">{line.componentName}</div>
-                    </td>
-                    <td className="px-2 py-2 text-muted">{line.quantity}</td>
-                    <td className="px-2 py-2 text-muted">{line.unitOfMeasure}</td>
-                    <td className="px-2 py-2 text-muted">{line.notes || "—"}</td>
-                  </tr>
-                ))}
-              </tbody>
-            </table>
-          </div>
-        )}
-      </section>
-      {(item.type === "ASSEMBLY" || item.type === "MANUFACTURED") ? (
-        <section className="rounded-[28px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
-          <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Manufacturing Routing</p>
-          <h4 className="mt-2 text-lg font-bold text-text">Station template</h4>
-          {item.operations.length === 0 ? (
-            <div className="mt-6 rounded-3xl border border-dashed border-line/70 bg-page/60 px-4 py-8 text-center text-sm text-muted">
-              No station operations are defined for this buildable item yet.
-            </div>
           ) : (
-            <div className="mt-6 overflow-hidden rounded-2xl border border-line/70">
+            <div className="mt-4 space-y-2">
-              <table className="min-w-full divide-y divide-line/70 text-sm">
+              {item.stockBalances.map((balance) => (
-                <thead className="bg-page/80 text-left text-muted">
+                <div key={`${balance.warehouseId}-${balance.locationId}`} className="flex items-center justify-between rounded-2xl border border-line/70 bg-page/60 px-2 py-2 text-sm">
-                  <tr>
+                  <div className="min-w-0">
-                    <th className="px-2 py-2">Position</th>
+                    <div className="font-semibold text-text">
-                    <th className="px-2 py-2">Station</th>
+                      {balance.warehouseCode} / {balance.locationCode}
-                    <th className="px-2 py-2">Setup</th>
+                    </div>
-                    <th className="px-2 py-2">Run / Unit</th>
+                    <div className="text-xs text-muted">
-                    <th className="px-2 py-2">Move</th>
+                      {balance.warehouseName} / {balance.locationName}
-                    <th className="px-2 py-2">Notes</th>
+                    </div>
-                  </tr>
+                  </div>
-                </thead>
+                  <div className="text-right">
-                <tbody className="divide-y divide-line/70 bg-surface">
+                    <div className="font-semibold text-text">{balance.quantityOnHand} on hand</div>
-                  {item.operations.map((operation) => (
+                    <div className="text-xs text-muted">{balance.quantityReserved} reserved / {balance.quantityAvailable} available</div>
-                    <tr key={operation.id}>
+                  </div>
-                      <td className="px-2 py-2 text-muted">{operation.position}</td>
+                </div>
-                      <td className="px-2 py-2">
+              ))}
-                        <div className="font-semibold text-text">{operation.stationCode}</div>
-                        <div className="mt-1 text-xs text-muted">{operation.stationName}</div>
-                      </td>
-                      <td className="px-2 py-2 text-muted">{operation.setupMinutes} min</td>
-                      <td className="px-2 py-2 text-muted">{operation.runMinutesPerUnit} min</td>
-                      <td className="px-2 py-2 text-muted">{operation.moveMinutes} min</td>
-                      <td className="px-2 py-2 text-muted">{operation.notes || "-"}</td>
-                    </tr>
-                  ))}
-                </tbody>
-              </table>
             </div>
           )}
-        </section>
+        </article>
-      ) : null}
+      </div>
-      <section className="grid gap-3 2xl:grid-cols-[minmax(360px,0.82fr)_minmax(0,1.18fr)]">
+
+      <section className="grid gap-3 xl:grid-cols-2">
         {canManage ? (
-          <article className="rounded-[28px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
+          <form className="rounded-[28px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5" onSubmit={handleTransactionSubmit}>
             <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Stock Transactions</p>
-            <h4 className="mt-2 text-lg font-bold text-text">Record movement</h4>
+            <div className="mt-5 grid gap-3">
-            <p className="mt-2 text-sm text-muted">Post receipts, issues, and adjustments to update on-hand inventory.</p>
-            <form className="mt-5 space-y-4" onSubmit={handleTransactionSubmit}>
               <div className="grid gap-3 xl:grid-cols-2">
                 <label className="block">
                   <span className="mb-2 block text-sm font-semibold text-text">Transaction type</span>
-                  <select
+                  <select value={transactionForm.transactionType} onChange={(event) => updateTransactionField("transactionType", event.target.value as InventoryTransactionInput["transactionType"])} className="w-full rounded-2xl border border-line/70 bg-page px-2 py-2 text-text outline-none transition focus:border-brand">
-                    value={transactionForm.transactionType}
-                    onChange={(event) => updateTransactionField("transactionType", event.target.value as InventoryTransactionInput["transactionType"])}
-                    className="w-full rounded-2xl border border-line/70 bg-page px-2 py-2 text-text outline-none transition focus:border-brand"
-                  >
                     {inventoryTransactionOptions.map((option) => (
                       <option key={option.value} value={option.value}>
                         {option.label}
@@ -304,29 +305,18 @@ export function InventoryDetailPage() {
                 </label>
                 <label className="block">
                   <span className="mb-2 block text-sm font-semibold text-text">Quantity</span>
-                  <input
+                  <input type="number" min={1} step={1} value={transactionForm.quantity} onChange={(event) => updateTransactionField("quantity", Number.parseInt(event.target.value, 10) || 0)} className="w-full rounded-2xl border border-line/70 bg-page px-2 py-2 text-text outline-none transition focus:border-brand" />
-                    type="number"
-                    min={1}
-                    step={1}
-                    value={transactionForm.quantity}
-                    onChange={(event) => updateTransactionField("quantity", Number.parseInt(event.target.value, 10) || 0)}
-                    className="w-full rounded-2xl border border-line/70 bg-page px-2 py-2 text-text outline-none transition focus:border-brand"
-                  />
                 </label>
               </div>
               <label className="block">
                 <span className="mb-2 block text-sm font-semibold text-text">Stock location</span>
-                <select
+                <select value={transactionForm.locationId} onChange={(event) => {
-                  value={transactionForm.locationId}
+                  const nextLocation = locationOptions.find((option) => option.locationId === event.target.value);
-                  onChange={(event) => {
+                  updateTransactionField("locationId", event.target.value);
-                    const nextLocation = locationOptions.find((option) => option.locationId === event.target.value);
+                  if (nextLocation) {
-                    updateTransactionField("locationId", event.target.value);
+                    updateTransactionField("warehouseId", nextLocation.warehouseId);
-                    if (nextLocation) {
+                  }
-                      updateTransactionField("warehouseId", nextLocation.warehouseId);
+                }} className="w-full rounded-2xl border border-line/70 bg-page px-2 py-2 text-text outline-none transition focus:border-brand">
-                    }
-                  }}
-                  className="w-full rounded-2xl border border-line/70 bg-page px-2 py-2 text-text outline-none transition focus:border-brand"
-                >
                   {locationOptions.map((option) => (
                     <option key={option.locationId} value={option.locationId}>
                       {option.warehouseCode} / {option.locationCode}
@@ -336,38 +326,23 @@ export function InventoryDetailPage() {
               </label>
               <label className="block">
                 <span className="mb-2 block text-sm font-semibold text-text">Reference</span>
-                <input
+                <input value={transactionForm.reference} onChange={(event) => updateTransactionField("reference", event.target.value)} placeholder="PO, WO, adjustment note, etc." className="w-full rounded-2xl border border-line/70 bg-page px-2 py-2 text-text outline-none transition focus:border-brand" />
-                  value={transactionForm.reference}
-                  onChange={(event) => updateTransactionField("reference", event.target.value)}
-                  placeholder="PO, WO, adjustment note, etc."
-                  className="w-full rounded-2xl border border-line/70 bg-page px-2 py-2 text-text outline-none transition focus:border-brand"
-                />
               </label>
               <label className="block">
                 <span className="mb-2 block text-sm font-semibold text-text">Notes</span>
-                <textarea
+                <textarea value={transactionForm.notes} onChange={(event) => updateTransactionField("notes", event.target.value)} rows={3} className="w-full rounded-3xl border border-line/70 bg-page px-2 py-2 text-text outline-none transition focus:border-brand" />
-                  value={transactionForm.notes}
-                  onChange={(event) => updateTransactionField("notes", event.target.value)}
-                  rows={3}
-                  className="w-full rounded-3xl border border-line/70 bg-page px-2 py-2 text-text outline-none transition focus:border-brand"
-                />
               </label>
-              <div className="flex flex-col gap-3 rounded-2xl border border-line/70 bg-page/70 px-2 py-2 sm:flex-row sm:items-center sm:justify-between">
+              <div className="flex flex-col gap-3 rounded-2xl border border-line/70 bg-page/70 px-2 py-2">
-                <span className="min-w-0 text-sm text-muted">{transactionStatus}</span>
+                <span className="text-sm text-muted">{transactionStatus}</span>
-                <button
+                <button type="submit" disabled={isSavingTransaction} className="rounded-2xl bg-brand px-2 py-2 text-sm font-semibold text-white disabled:cursor-not-allowed disabled:opacity-60">
-                  type="submit"
-                  disabled={isSavingTransaction || locationOptions.length === 0}
-                  className="rounded-2xl bg-brand px-2 py-2 text-sm font-semibold text-white disabled:cursor-not-allowed disabled:opacity-60"
-                >
                   {isSavingTransaction ? "Posting..." : "Post transaction"}
                 </button>
               </div>
-            </form>
+            </div>
-          </article>
+          </form>
         ) : null}
         <article className="rounded-[28px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
-          <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Stock History</p>
+          <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Recent Movements</p>
-          <h4 className="mt-2 text-lg font-bold text-text">Recent movements</h4>
           {item.recentTransactions.length === 0 ? (
             <div className="mt-6 rounded-3xl border border-dashed border-line/70 bg-page/60 px-4 py-8 text-center text-sm text-muted">
               No stock transactions have been recorded for this item yet.
@@ -388,9 +363,6 @@ export function InventoryDetailPage() {
                       <div className="mt-2 text-sm font-semibold text-text">
                         {transaction.warehouseCode} / {transaction.locationCode}
                       </div>
-                      <div className="text-xs text-muted">
-                        {transaction.warehouseName} · {transaction.locationName}
-                      </div>
                       {transaction.reference ? <div className="mt-2 text-xs text-muted">Ref: {transaction.reference}</div> : null}
                       {transaction.notes ? <p className="mt-2 whitespace-pre-line text-sm leading-6 text-text">{transaction.notes}</p> : null}
                     </div>
@@ -405,6 +377,154 @@ export function InventoryDetailPage() {
           )}
         </article>
       </section>
+
+      {canManage ? (
+        <section className="grid gap-3 xl:grid-cols-2">
+          <form className="rounded-[28px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5" onSubmit={handleTransferSubmit}>
+            <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Inventory Transfer</p>
+            <div className="mt-5 grid gap-3">
+              <label className="block">
+                <span className="mb-2 block text-sm font-semibold text-text">Quantity</span>
+                <input type="number" min={1} step={1} value={transferForm.quantity} onChange={(event) => updateTransferField("quantity", Number.parseInt(event.target.value, 10) || 1)} className="w-full rounded-2xl border border-line/70 bg-page px-2 py-2 text-text outline-none transition focus:border-brand" />
+              </label>
+              <div className="grid gap-3 sm:grid-cols-2">
+                <label className="block">
+                  <span className="mb-2 block text-sm font-semibold text-text">From</span>
+                  <select value={transferForm.fromLocationId} onChange={(event) => {
+                    const option = locationOptions.find((entry) => entry.locationId === event.target.value);
+                    updateTransferField("fromLocationId", event.target.value);
+                    if (option) {
+                      updateTransferField("fromWarehouseId", option.warehouseId);
+                    }
+                  }} className="w-full rounded-2xl border border-line/70 bg-page px-2 py-2 text-text outline-none transition focus:border-brand">
+                    {locationOptions.map((option) => (
+                      <option key={`from-${option.locationId}`} value={option.locationId}>
+                        {option.warehouseCode} / {option.locationCode}
+                      </option>
+                    ))}
+                  </select>
+                </label>
+                <label className="block">
+                  <span className="mb-2 block text-sm font-semibold text-text">To</span>
+                  <select value={transferForm.toLocationId} onChange={(event) => {
+                    const option = locationOptions.find((entry) => entry.locationId === event.target.value);
+                    updateTransferField("toLocationId", event.target.value);
+                    if (option) {
+                      updateTransferField("toWarehouseId", option.warehouseId);
+                    }
+                  }} className="w-full rounded-2xl border border-line/70 bg-page px-2 py-2 text-text outline-none transition focus:border-brand">
+                    {locationOptions.map((option) => (
+                      <option key={`to-${option.locationId}`} value={option.locationId}>
+                        {option.warehouseCode} / {option.locationCode}
+                      </option>
+                    ))}
+                  </select>
+                </label>
+              </div>
+              <label className="block">
+                <span className="mb-2 block text-sm font-semibold text-text">Notes</span>
+                <textarea value={transferForm.notes} onChange={(event) => updateTransferField("notes", event.target.value)} rows={3} className="w-full rounded-3xl border border-line/70 bg-page px-2 py-2 text-text outline-none transition focus:border-brand" />
+              </label>
+              <div className="flex flex-col gap-3 rounded-2xl border border-line/70 bg-page/70 px-2 py-2">
+                <span className="text-sm text-muted">{transferStatus}</span>
+                <button type="submit" disabled={isSavingTransfer} className="rounded-2xl bg-brand px-2 py-2 text-sm font-semibold text-white disabled:cursor-not-allowed disabled:opacity-60">
+                  {isSavingTransfer ? "Posting transfer..." : "Post transfer"}
+                </button>
+              </div>
+            </div>
+          </form>
+          <form className="rounded-[28px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5" onSubmit={handleReservationSubmit}>
+            <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Manual Reservation</p>
+            <div className="mt-5 grid gap-3">
+              <label className="block">
+                <span className="mb-2 block text-sm font-semibold text-text">Quantity</span>
+                <input type="number" min={1} step={1} value={reservationForm.quantity} onChange={(event) => setReservationForm((current) => ({ ...current, quantity: Number.parseInt(event.target.value, 10) || 1 }))} className="w-full rounded-2xl border border-line/70 bg-page px-2 py-2 text-text outline-none transition focus:border-brand" />
+              </label>
+              <label className="block">
+                <span className="mb-2 block text-sm font-semibold text-text">Location</span>
+                <select value={reservationForm.locationId ?? ""} onChange={(event) => {
+                  const option = locationOptions.find((entry) => entry.locationId === event.target.value);
+                  setReservationForm((current) => ({
+                    ...current,
+                    locationId: event.target.value || null,
+                    warehouseId: option ? option.warehouseId : null,
+                  }));
+                }} className="w-full rounded-2xl border border-line/70 bg-page px-2 py-2 text-text outline-none transition focus:border-brand">
+                  <option value="">Global / not location-specific</option>
+                  {locationOptions.map((option) => (
+                    <option key={option.locationId} value={option.locationId}>
+                      {option.warehouseCode} / {option.locationCode}
+                    </option>
+                  ))}
+                </select>
+              </label>
+              <label className="block">
+                <span className="mb-2 block text-sm font-semibold text-text">Notes</span>
+                <textarea value={reservationForm.notes} onChange={(event) => setReservationForm((current) => ({ ...current, notes: event.target.value }))} rows={3} className="w-full rounded-3xl border border-line/70 bg-page px-2 py-2 text-text outline-none transition focus:border-brand" />
+              </label>
+              <div className="flex flex-col gap-3 rounded-2xl border border-line/70 bg-page/70 px-2 py-2">
+                <span className="text-sm text-muted">{reservationStatus}</span>
+                <button type="submit" disabled={isSavingReservation} className="rounded-2xl bg-brand px-2 py-2 text-sm font-semibold text-white disabled:cursor-not-allowed disabled:opacity-60">
+                  {isSavingReservation ? "Saving reservation..." : "Create reservation"}
+                </button>
+              </div>
+            </div>
+          </form>
+        </section>
+      ) : null}
+
+      <section className="grid gap-3 xl:grid-cols-2">
+        <article className="rounded-[28px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
+          <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Reservations</p>
+          {item.reservations.length === 0 ? (
+            <div className="mt-6 rounded-3xl border border-dashed border-line/70 bg-page/60 px-4 py-8 text-center text-sm text-muted">
+              No reservations have been recorded for this item.
+            </div>
+          ) : (
+            <div className="mt-5 space-y-3">
+              {item.reservations.map((reservation) => (
+                <article key={reservation.id} className="rounded-3xl border border-line/70 bg-page/60 p-3">
+                  <div className="flex items-center justify-between gap-3">
+                    <div>
+                      <div className="font-semibold text-text">{reservation.quantity} reserved</div>
+                      <div className="mt-1 text-xs text-muted">{reservation.sourceLabel ?? reservation.sourceType}</div>
+                    </div>
+                    <div className="text-xs text-muted">{reservation.status}</div>
+                  </div>
+                  <div className="mt-2 text-xs text-muted">
+                    {reservation.warehouseCode && reservation.locationCode ? `${reservation.warehouseCode} / ${reservation.locationCode}` : "Not location-specific"}
+                  </div>
+                  <div className="mt-2 text-sm text-text">{reservation.notes || "No notes recorded."}</div>
+                </article>
+              ))}
+            </div>
+          )}
+        </article>
+        <article className="rounded-[28px] border border-line/70 bg-surface/90 p-4 shadow-panel 2xl:p-5">
+          <p className="text-xs font-semibold uppercase tracking-[0.24em] text-muted">Transfers</p>
+          {item.transfers.length === 0 ? (
+            <div className="mt-6 rounded-3xl border border-dashed border-line/70 bg-page/60 px-4 py-8 text-center text-sm text-muted">
+              No transfers have been recorded for this item.
+            </div>
+          ) : (
+            <div className="mt-5 space-y-3">
+              {item.transfers.map((transfer) => (
+                <article key={transfer.id} className="rounded-3xl border border-line/70 bg-page/60 p-3">
+                  <div className="flex items-center justify-between gap-3">
+                    <div className="font-semibold text-text">{transfer.quantity} moved</div>
+                    <div className="text-xs text-muted">{new Date(transfer.createdAt).toLocaleString()}</div>
+                  </div>
+                  <div className="mt-2 text-xs text-muted">
+                    {transfer.fromWarehouseCode} / {transfer.fromLocationCode} to {transfer.toWarehouseCode} / {transfer.toLocationCode}
+                  </div>
+                  <div className="mt-2 text-sm text-text">{transfer.notes || "No notes recorded."}</div>
+                </article>
+              ))}
+            </div>
+          )}
+        </article>
+      </section>
+
       <InventoryAttachmentsPanel itemId={item.id} />
     </section>
   );

client/src/modules/manufacturing/ManufacturingPage.tsx

@@ -71,7 +71,7 @@ export function ManufacturingPage() {
                       <div className="mt-1 text-xs text-muted">{station.description || "No description"}</div>
                     </div>
                     <div className="text-right text-xs text-muted">
-                      <div>{station.queueDays} queue day(s)</div>
+                      <div>{station.queueDays} expected wait day(s)</div>
                       <div className="mt-1">{station.isActive ? "Active" : "Inactive"}</div>
                     </div>
                   </div>
@@ -93,7 +93,7 @@ export function ManufacturingPage() {
                 <input value={form.name} onChange={(event) => setForm((current) => ({ ...current, name: event.target.value }))} className="w-full rounded-2xl border border-line/70 bg-page px-2 py-2 text-text outline-none transition focus:border-brand" />
               </label>
               <label className="block">
-                <span className="mb-2 block text-sm font-semibold text-text">Queue Days</span>
+                <span className="mb-2 block text-sm font-semibold text-text">Expected Wait (Days)</span>
                 <input type="number" min={0} step={1} value={form.queueDays} onChange={(event) => setForm((current) => ({ ...current, queueDays: Number.parseInt(event.target.value, 10) || 0 }))} className="w-full rounded-2xl border border-line/70 bg-page px-2 py-2 text-text outline-none transition focus:border-brand" />
               </label>
               <label className="block">

server/prisma/migrations/20260315195500_inventory_transfers_and_reservations/migration.sql

@@ -0,0 +1,43 @@
+CREATE TABLE "InventoryTransfer" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "itemId" TEXT NOT NULL,
+    "fromWarehouseId" TEXT NOT NULL,
+    "fromLocationId" TEXT NOT NULL,
+    "toWarehouseId" TEXT NOT NULL,
+    "toLocationId" TEXT NOT NULL,
+    "quantity" INTEGER NOT NULL,
+    "notes" TEXT NOT NULL,
+    "createdById" TEXT,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" DATETIME NOT NULL,
+    CONSTRAINT "InventoryTransfer_itemId_fkey" FOREIGN KEY ("itemId") REFERENCES "InventoryItem" ("id") ON DELETE CASCADE ON UPDATE CASCADE,
+    CONSTRAINT "InventoryTransfer_fromWarehouseId_fkey" FOREIGN KEY ("fromWarehouseId") REFERENCES "Warehouse" ("id") ON DELETE RESTRICT ON UPDATE CASCADE,
+    CONSTRAINT "InventoryTransfer_fromLocationId_fkey" FOREIGN KEY ("fromLocationId") REFERENCES "WarehouseLocation" ("id") ON DELETE RESTRICT ON UPDATE CASCADE,
+    CONSTRAINT "InventoryTransfer_toWarehouseId_fkey" FOREIGN KEY ("toWarehouseId") REFERENCES "Warehouse" ("id") ON DELETE RESTRICT ON UPDATE CASCADE,
+    CONSTRAINT "InventoryTransfer_toLocationId_fkey" FOREIGN KEY ("toLocationId") REFERENCES "WarehouseLocation" ("id") ON DELETE RESTRICT ON UPDATE CASCADE,
+    CONSTRAINT "InventoryTransfer_createdById_fkey" FOREIGN KEY ("createdById") REFERENCES "User" ("id") ON DELETE SET NULL ON UPDATE CASCADE
+);
+
+CREATE TABLE "InventoryReservation" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "itemId" TEXT NOT NULL,
+    "warehouseId" TEXT,
+    "locationId" TEXT,
+    "workOrderId" TEXT,
+    "sourceType" TEXT NOT NULL,
+    "sourceId" TEXT,
+    "quantity" INTEGER NOT NULL,
+    "status" TEXT NOT NULL DEFAULT 'ACTIVE',
+    "notes" TEXT NOT NULL,
+    "createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" DATETIME NOT NULL,
+    CONSTRAINT "InventoryReservation_itemId_fkey" FOREIGN KEY ("itemId") REFERENCES "InventoryItem" ("id") ON DELETE CASCADE ON UPDATE CASCADE,
+    CONSTRAINT "InventoryReservation_warehouseId_fkey" FOREIGN KEY ("warehouseId") REFERENCES "Warehouse" ("id") ON DELETE SET NULL ON UPDATE CASCADE,
+    CONSTRAINT "InventoryReservation_locationId_fkey" FOREIGN KEY ("locationId") REFERENCES "WarehouseLocation" ("id") ON DELETE SET NULL ON UPDATE CASCADE,
+    CONSTRAINT "InventoryReservation_workOrderId_fkey" FOREIGN KEY ("workOrderId") REFERENCES "WorkOrder" ("id") ON DELETE CASCADE ON UPDATE CASCADE
+);
+
+CREATE INDEX "InventoryTransfer_itemId_createdAt_idx" ON "InventoryTransfer"("itemId", "createdAt");
+CREATE INDEX "InventoryReservation_itemId_status_createdAt_idx" ON "InventoryReservation"("itemId", "status", "createdAt");
+CREATE INDEX "InventoryReservation_warehouseId_locationId_status_idx" ON "InventoryReservation"("warehouseId", "locationId", "status");
+CREATE INDEX "InventoryReservation_workOrderId_status_idx" ON "InventoryReservation"("workOrderId", "status");

server/prisma/schema.prisma

@@ -28,6 +28,7 @@ model User {
   approvedSalesOrders SalesOrder[] @relation("SalesOrderApprovedBy")
   salesQuoteRevisionsCreated SalesQuoteRevision[] @relation("SalesQuoteRevisionCreatedBy")
   salesOrderRevisionsCreated SalesOrderRevision[] @relation("SalesOrderRevisionCreatedBy")
+  inventoryTransfersCreated InventoryTransfer[] @relation("InventoryTransferCreatedBy")
 }
 
 model Role {
@@ -134,6 +135,8 @@ model InventoryItem {
   workOrders WorkOrder[]
   workOrderMaterialIssues WorkOrderMaterialIssue[]
   operations InventoryItemOperation[]
+  reservations InventoryReservation[]
+  transfers InventoryTransfer[]
 }
 
 model Warehouse {
@@ -148,6 +151,9 @@ model Warehouse {
   purchaseReceipts PurchaseReceipt[]
   workOrders WorkOrder[]
   workOrderMaterialIssues WorkOrderMaterialIssue[]
+  reservations InventoryReservation[]
+  transferSources InventoryTransfer[] @relation("InventoryTransferFromWarehouse")
+  transferDestinations InventoryTransfer[] @relation("InventoryTransferToWarehouse")
 }
 
 model Customer {
@@ -216,6 +222,9 @@ model WarehouseLocation {
   purchaseReceipts PurchaseReceipt[]
   workOrders WorkOrder[]
   workOrderMaterialIssues WorkOrderMaterialIssue[]
+  reservations InventoryReservation[]
+  transferSourceLocations InventoryTransfer[] @relation("InventoryTransferFromLocation")
+  transferDestinationLocations InventoryTransfer[] @relation("InventoryTransferToLocation")
 
   @@unique([warehouseId, code])
   @@index([warehouseId])
@@ -243,6 +252,51 @@ model InventoryTransaction {
   @@index([locationId, createdAt])
 }
 
+model InventoryTransfer {
+  id              String   @id @default(cuid())
+  itemId          String
+  fromWarehouseId String
+  fromLocationId  String
+  toWarehouseId   String
+  toLocationId    String
+  quantity        Int
+  notes           String
+  createdById     String?
+  createdAt       DateTime @default(now())
+  updatedAt       DateTime @updatedAt
+  item            InventoryItem @relation(fields: [itemId], references: [id], onDelete: Cascade)
+  fromWarehouse   Warehouse @relation("InventoryTransferFromWarehouse", fields: [fromWarehouseId], references: [id], onDelete: Restrict)
+  fromLocation    WarehouseLocation @relation("InventoryTransferFromLocation", fields: [fromLocationId], references: [id], onDelete: Restrict)
+  toWarehouse     Warehouse @relation("InventoryTransferToWarehouse", fields: [toWarehouseId], references: [id], onDelete: Restrict)
+  toLocation      WarehouseLocation @relation("InventoryTransferToLocation", fields: [toLocationId], references: [id], onDelete: Restrict)
+  createdBy       User? @relation("InventoryTransferCreatedBy", fields: [createdById], references: [id], onDelete: SetNull)
+
+  @@index([itemId, createdAt])
+}
+
+model InventoryReservation {
+  id          String   @id @default(cuid())
+  itemId      String
+  warehouseId String?
+  locationId  String?
+  workOrderId String?
+  sourceType  String
+  sourceId    String?
+  quantity    Int
+  status      String   @default("ACTIVE")
+  notes       String
+  createdAt   DateTime @default(now())
+  updatedAt   DateTime @updatedAt
+  item        InventoryItem @relation(fields: [itemId], references: [id], onDelete: Cascade)
+  warehouse   Warehouse? @relation(fields: [warehouseId], references: [id], onDelete: SetNull)
+  location    WarehouseLocation? @relation(fields: [locationId], references: [id], onDelete: SetNull)
+  workOrder   WorkOrder? @relation(fields: [workOrderId], references: [id], onDelete: Cascade)
+
+  @@index([itemId, status, createdAt])
+  @@index([warehouseId, locationId, status])
+  @@index([workOrderId, status])
+}
+
 model Vendor {
   id           String   @id @default(cuid())
   name         String
@@ -480,6 +534,7 @@ model WorkOrder {
   operations        WorkOrderOperation[]
   materialIssues    WorkOrderMaterialIssue[]
   completions       WorkOrderCompletion[]
+  reservations      InventoryReservation[]
 
   @@index([itemId, createdAt])
   @@index([projectId, dueDate])

server/src/modules/inventory/router.ts

@@ -7,6 +7,8 @@ import { fail, ok } from "../../lib/http.js";
 import { requirePermissions } from "../../lib/rbac.js";
 import {
   createInventoryItem,
+  createInventoryReservation,
+  createInventoryTransfer,
   createInventoryTransaction,
   createWarehouse,
   getInventoryItemById,
@@ -67,6 +69,22 @@ const inventoryTransactionSchema = z.object({
   notes: z.string(),
 });
 
+const inventoryTransferSchema = z.object({
+  quantity: z.number().int().positive(),
+  fromWarehouseId: z.string().trim().min(1),
+  fromLocationId: z.string().trim().min(1),
+  toWarehouseId: z.string().trim().min(1),
+  toLocationId: z.string().trim().min(1),
+  notes: z.string(),
+});
+
+const inventoryReservationSchema = z.object({
+  quantity: z.number().int().positive(),
+  warehouseId: z.string().trim().min(1).nullable(),
+  locationId: z.string().trim().min(1).nullable(),
+  notes: z.string(),
+});
+
 const warehouseLocationSchema = z.object({
   code: z.string().trim().min(1).max(64),
   name: z.string().trim().min(1).max(160),
@@ -176,6 +194,44 @@ inventoryRouter.post("/items/:itemId/transactions", requirePermissions([permissi
   return ok(response, result.item, 201);
 });
 
+inventoryRouter.post("/items/:itemId/transfers", requirePermissions([permissions.inventoryWrite]), async (request, response) => {
+  const itemId = getRouteParam(request.params.itemId);
+  if (!itemId) {
+    return fail(response, 400, "INVALID_INPUT", "Inventory item id is invalid.");
+  }
+
+  const parsed = inventoryTransferSchema.safeParse(request.body);
+  if (!parsed.success) {
+    return fail(response, 400, "INVALID_INPUT", "Inventory transfer payload is invalid.");
+  }
+
+  const result = await createInventoryTransfer(itemId, parsed.data, request.authUser?.id);
+  if (!result.ok) {
+    return fail(response, 400, "INVALID_INPUT", result.reason);
+  }
+
+  return ok(response, result.item, 201);
+});
+
+inventoryRouter.post("/items/:itemId/reservations", requirePermissions([permissions.inventoryWrite]), async (request, response) => {
+  const itemId = getRouteParam(request.params.itemId);
+  if (!itemId) {
+    return fail(response, 400, "INVALID_INPUT", "Inventory item id is invalid.");
+  }
+
+  const parsed = inventoryReservationSchema.safeParse(request.body);
+  if (!parsed.success) {
+    return fail(response, 400, "INVALID_INPUT", "Inventory reservation payload is invalid.");
+  }
+
+  const result = await createInventoryReservation(itemId, parsed.data);
+  if (!result.ok) {
+    return fail(response, 400, "INVALID_INPUT", result.reason);
+  }
+
+  return ok(response, result.item, 201);
+});
+
 inventoryRouter.get("/warehouses", requirePermissions([permissions.inventoryRead]), async (_request, response) => {
   return ok(response, await listWarehouses());
 });

server/src/modules/inventory/service.ts

@@ -4,7 +4,12 @@ import type {
   InventoryItemDetailDto,
   InventoryItemInput,
   InventoryItemOperationDto,
+  InventoryReservationDto,
+  InventoryReservationInput,
+  InventoryReservationStatus,
   InventoryStockBalanceDto,
+  InventoryTransferDto,
+  InventoryTransferInput,
   WarehouseDetailDto,
   WarehouseInput,
   WarehouseLocationOptionDto,
@@ -67,6 +72,8 @@ type InventoryDetailRecord = {
   bomLines: BomLineRecord[];
   operations: OperationRecord[];
   inventoryTransactions: InventoryTransactionRecord[];
+  reservations: InventoryReservationRecord[];
+  transfers: InventoryTransferRecord[];
 };
 
 type InventoryTransactionRecord = {
@@ -109,6 +116,61 @@ type WarehouseDetailRecord = {
   locations: WarehouseLocationRecord[];
 };
 
+type InventoryReservationRecord = {
+  id: string;
+  quantity: number;
+  status: string;
+  sourceType: string;
+  sourceId: string | null;
+  notes: string;
+  createdAt: Date;
+  warehouse: {
+    id: string;
+    code: string;
+    name: string;
+  } | null;
+  location: {
+    id: string;
+    code: string;
+    name: string;
+  } | null;
+  workOrder: {
+    id: string;
+    workOrderNumber: string;
+  } | null;
+};
+
+type InventoryTransferRecord = {
+  id: string;
+  quantity: number;
+  notes: string;
+  createdAt: Date;
+  fromWarehouse: {
+    id: string;
+    code: string;
+    name: string;
+  };
+  fromLocation: {
+    id: string;
+    code: string;
+    name: string;
+  };
+  toWarehouse: {
+    id: string;
+    code: string;
+    name: string;
+  };
+  toLocation: {
+    id: string;
+    code: string;
+    name: string;
+  };
+  createdBy: {
+    firstName: string;
+    lastName: string;
+  } | null;
+};
+
 function mapBomLine(record: BomLineRecord): InventoryBomLineDto {
   return {
     id: record.id,
@@ -172,7 +234,48 @@ function mapInventoryTransaction(record: InventoryTransactionRecord): InventoryT
   };
 }
 
-function buildStockBalances(transactions: InventoryTransactionRecord[]): InventoryStockBalanceDto[] {
+function mapReservation(record: InventoryReservationRecord): InventoryReservationDto {
+  return {
+    id: record.id,
+    quantity: record.quantity,
+    status: record.status as InventoryReservationStatus,
+    sourceType: record.sourceType,
+    sourceId: record.sourceId,
+    sourceLabel: record.workOrder ? record.workOrder.workOrderNumber : null,
+    notes: record.notes,
+    createdAt: record.createdAt.toISOString(),
+    warehouseId: record.warehouse?.id ?? null,
+    warehouseCode: record.warehouse?.code ?? null,
+    warehouseName: record.warehouse?.name ?? null,
+    locationId: record.location?.id ?? null,
+    locationCode: record.location?.code ?? null,
+    locationName: record.location?.name ?? null,
+  };
+}
+
+function mapTransfer(record: InventoryTransferRecord): InventoryTransferDto {
+  return {
+    id: record.id,
+    quantity: record.quantity,
+    notes: record.notes,
+    createdAt: record.createdAt.toISOString(),
+    createdByName: record.createdBy ? `${record.createdBy.firstName} ${record.createdBy.lastName}`.trim() : "System",
+    fromWarehouseId: record.fromWarehouse.id,
+    fromWarehouseCode: record.fromWarehouse.code,
+    fromWarehouseName: record.fromWarehouse.name,
+    fromLocationId: record.fromLocation.id,
+    fromLocationCode: record.fromLocation.code,
+    fromLocationName: record.fromLocation.name,
+    toWarehouseId: record.toWarehouse.id,
+    toWarehouseCode: record.toWarehouse.code,
+    toWarehouseName: record.toWarehouse.name,
+    toLocationId: record.toLocation.id,
+    toLocationCode: record.toLocation.code,
+    toLocationName: record.toLocation.name,
+  };
+}
+
+function buildStockBalances(transactions: InventoryTransactionRecord[], reservations: InventoryReservationRecord[]): InventoryStockBalanceDto[] {
   const grouped = new Map<string, InventoryStockBalanceDto>();
 
   for (const transaction of transactions) {
@@ -194,11 +297,40 @@ function buildStockBalances(transactions: InventoryTransactionRecord[]): Invento
       locationCode: transaction.location.code,
       locationName: transaction.location.name,
       quantityOnHand: signedQuantity,
+      quantityReserved: 0,
+      quantityAvailable: signedQuantity,
+    });
+  }
+
+  for (const reservation of reservations) {
+    if (!reservation.warehouse || !reservation.location || reservation.status !== "ACTIVE") {
+      continue;
+    }
+
+    const key = `${reservation.warehouse.id}:${reservation.location.id}`;
+    const current = grouped.get(key);
+
+    if (current) {
+      current.quantityReserved += reservation.quantity;
+      current.quantityAvailable = current.quantityOnHand - current.quantityReserved;
+      continue;
+    }
+
+    grouped.set(key, {
+      warehouseId: reservation.warehouse.id,
+      warehouseCode: reservation.warehouse.code,
+      warehouseName: reservation.warehouse.name,
+      locationId: reservation.location.id,
+      locationCode: reservation.location.code,
+      locationName: reservation.location.name,
+      quantityOnHand: 0,
+      quantityReserved: reservation.quantity,
+      quantityAvailable: -reservation.quantity,
     });
   }
 
   return [...grouped.values()]
-    .filter((balance) => balance.quantityOnHand !== 0)
+    .filter((balance) => balance.quantityOnHand !== 0 || balance.quantityReserved !== 0)
     .sort((left, right) =>
       `${left.warehouseCode}-${left.locationCode}`.localeCompare(`${right.warehouseCode}-${right.locationCode}`)
     );
@@ -235,7 +367,13 @@ function mapDetail(record: InventoryDetailRecord): InventoryItemDetailDto {
     .slice()
     .sort((left, right) => right.createdAt.getTime() - left.createdAt.getTime())
     .map(mapInventoryTransaction);
-  const stockBalances = buildStockBalances(record.inventoryTransactions);
+  const activeReservations = record.reservations.filter((reservation) => reservation.status === "ACTIVE");
+  const stockBalances = buildStockBalances(record.inventoryTransactions, activeReservations);
+  const reservedQuantity = activeReservations.reduce((sum, reservation) => sum + reservation.quantity, 0);
+  const transferHistory = record.transfers
+    .slice()
+    .sort((left, right) => right.createdAt.getTime() - left.createdAt.getTime())
+    .map(mapTransfer);
 
   return {
     ...mapSummary({
@@ -258,8 +396,12 @@ function mapDetail(record: InventoryDetailRecord): InventoryItemDetailDto {
     bomLines: record.bomLines.slice().sort((a, b) => a.position - b.position).map(mapBomLine),
     operations: record.operations.slice().sort((a, b) => a.position - b.position).map(mapOperation),
     onHandQuantity: stockBalances.reduce((sum, balance) => sum + balance.quantityOnHand, 0),
+    reservedQuantity,
+    availableQuantity: stockBalances.reduce((sum, balance) => sum + balance.quantityAvailable, 0),
     stockBalances,
     recentTransactions,
+    transfers: transferHistory,
+    reservations: record.reservations.slice().sort((left, right) => right.createdAt.getTime() - left.createdAt.getTime()).map(mapReservation),
   };
 }
 
@@ -353,6 +495,24 @@ function normalizeWarehouseLocations(locations: WarehouseLocationInput[]) {
     .filter((location) => location.code.length > 0 && location.name.length > 0);
 }
 
+async function getItemLocationOnHand(itemId: string, warehouseId: string, locationId: string) {
+  const transactions = await prisma.inventoryTransaction.findMany({
+    where: {
+      itemId,
+      warehouseId,
+      locationId,
+    },
+    select: {
+      transactionType: true,
+      quantity: true,
+    },
+  });
+
+  return transactions.reduce((total, transaction) => {
+    return total + (transaction.transactionType === "RECEIPT" || transaction.transactionType === "ADJUSTMENT_IN" ? transaction.quantity : -transaction.quantity);
+  }, 0);
+}
+
 async function validateBomLines(parentItemId: string | null, bomLines: InventoryBomLineInput[]) {
   const normalized = normalizeBomLines(bomLines);
 
@@ -434,6 +594,22 @@ async function validateOperations(type: InventoryItemType, operations: Inventory
   return { ok: true as const, operations: normalized };
 }
 
+async function getActiveReservedQuantity(itemId: string, warehouseId: string, locationId: string) {
+  const reservations = await prisma.inventoryReservation.findMany({
+    where: {
+      itemId,
+      warehouseId,
+      locationId,
+      status: "ACTIVE",
+    },
+    select: {
+      quantity: true,
+    },
+  });
+
+  return reservations.reduce((sum, reservation) => sum + reservation.quantity, 0);
+}
+
 export async function listInventoryItems(filters: InventoryListFilters = {}) {
   const items = await prisma.inventoryItem.findMany({
     where: buildWhereClause(filters),
@@ -529,6 +705,70 @@ export async function getInventoryItemById(itemId: string) {
         },
         orderBy: [{ createdAt: "desc" }],
       },
+      reservations: {
+        include: {
+          warehouse: {
+            select: {
+              id: true,
+              code: true,
+              name: true,
+            },
+          },
+          location: {
+            select: {
+              id: true,
+              code: true,
+              name: true,
+            },
+          },
+          workOrder: {
+            select: {
+              id: true,
+              workOrderNumber: true,
+            },
+          },
+        },
+        orderBy: [{ createdAt: "desc" }],
+      },
+      transfers: {
+        include: {
+          fromWarehouse: {
+            select: {
+              id: true,
+              code: true,
+              name: true,
+            },
+          },
+          fromLocation: {
+            select: {
+              id: true,
+              code: true,
+              name: true,
+            },
+          },
+          toWarehouse: {
+            select: {
+              id: true,
+              code: true,
+              name: true,
+            },
+          },
+          toLocation: {
+            select: {
+              id: true,
+              code: true,
+              name: true,
+            },
+          },
+          createdBy: {
+            select: {
+              firstName: true,
+              lastName: true,
+            },
+          },
+        },
+        orderBy: [{ createdAt: "desc" }],
+      },
     },
   });
 
@@ -579,14 +819,13 @@ export async function createInventoryTransaction(itemId: string, payload: Invent
     return { ok: false as const, reason: "Warehouse location is invalid for the selected warehouse." };
   }
 
-  const detail = await getInventoryItemById(itemId);
-  if (!detail) {
-    return { ok: false as const, reason: "Inventory item was not found." };
-  }
-
   const signedQuantity = getSignedQuantity(payload.transactionType, payload.quantity);
-  if (signedQuantity < 0 && detail.onHandQuantity + signedQuantity < 0) {
+  if (signedQuantity < 0) {
-    return { ok: false as const, reason: "Transaction would drive on-hand quantity below zero." };
+    const onHand = await getItemLocationOnHand(itemId, payload.warehouseId, payload.locationId);
+    const reserved = await getActiveReservedQuantity(itemId, payload.warehouseId, payload.locationId);
+    if (onHand - reserved + signedQuantity < 0) {
+      return { ok: false as const, reason: "Transaction would drive available quantity below zero at the selected location." };
+    }
   }
 
   await prisma.inventoryTransaction.create({
@@ -606,6 +845,134 @@ export async function createInventoryTransaction(itemId: string, payload: Invent
   return nextDetail ? { ok: true as const, item: nextDetail } : { ok: false as const, reason: "Unable to load updated inventory item." };
 }
 
+export async function createInventoryTransfer(itemId: string, payload: InventoryTransferInput, createdById?: string | null) {
+  const item = await prisma.inventoryItem.findUnique({
+    where: { id: itemId },
+    select: { id: true },
+  });
+
+  if (!item) {
+    return { ok: false as const, reason: "Inventory item was not found." };
+  }
+
+  const [fromLocation, toLocation] = await Promise.all([
+    prisma.warehouseLocation.findUnique({
+      where: { id: payload.fromLocationId },
+      select: { id: true, warehouseId: true },
+    }),
+    prisma.warehouseLocation.findUnique({
+      where: { id: payload.toLocationId },
+      select: { id: true, warehouseId: true },
+    }),
+  ]);
+
+  if (!fromLocation || fromLocation.warehouseId !== payload.fromWarehouseId) {
+    return { ok: false as const, reason: "Source location is invalid for the selected source warehouse." };
+  }
+
+  if (!toLocation || toLocation.warehouseId !== payload.toWarehouseId) {
+    return { ok: false as const, reason: "Destination location is invalid for the selected destination warehouse." };
+  }
+
+  const onHand = await getItemLocationOnHand(itemId, payload.fromWarehouseId, payload.fromLocationId);
+  const reserved = await getActiveReservedQuantity(itemId, payload.fromWarehouseId, payload.fromLocationId);
+  if (onHand - reserved < payload.quantity) {
+    return { ok: false as const, reason: "Transfer quantity exceeds available stock at the source location." };
+  }
+
+  await prisma.$transaction(async (tx) => {
+    await tx.inventoryTransfer.create({
+      data: {
+        itemId,
+        fromWarehouseId: payload.fromWarehouseId,
+        fromLocationId: payload.fromLocationId,
+        toWarehouseId: payload.toWarehouseId,
+        toLocationId: payload.toLocationId,
+        quantity: payload.quantity,
+        notes: payload.notes,
+        createdById: createdById ?? null,
+      },
+    });
+
+    await tx.inventoryTransaction.create({
+      data: {
+        itemId,
+        warehouseId: payload.fromWarehouseId,
+        locationId: payload.fromLocationId,
+        transactionType: "ISSUE",
+        quantity: payload.quantity,
+        reference: "Inventory transfer out",
+        notes: payload.notes,
+        createdById: createdById ?? null,
+      },
+    });
+
+    await tx.inventoryTransaction.create({
+      data: {
+        itemId,
+        warehouseId: payload.toWarehouseId,
+        locationId: payload.toLocationId,
+        transactionType: "RECEIPT",
+        quantity: payload.quantity,
+        reference: "Inventory transfer in",
+        notes: payload.notes,
+        createdById: createdById ?? null,
+      },
+    });
+  });
+
+  const nextDetail = await getInventoryItemById(itemId);
+  return nextDetail ? { ok: true as const, item: nextDetail } : { ok: false as const, reason: "Unable to load updated inventory item." };
+}
+
+export async function createInventoryReservation(itemId: string, payload: InventoryReservationInput) {
+  const item = await prisma.inventoryItem.findUnique({
+    where: { id: itemId },
+    select: { id: true },
+  });
+
+  if (!item) {
+    return { ok: false as const, reason: "Inventory item was not found." };
+  }
+
+  if ((payload.warehouseId && !payload.locationId) || (!payload.warehouseId && payload.locationId)) {
+    return { ok: false as const, reason: "Reservation warehouse and location must be provided together." };
+  }
+
+  if (payload.warehouseId && payload.locationId) {
+    const location = await prisma.warehouseLocation.findUnique({
+      where: { id: payload.locationId },
+      select: { warehouseId: true },
+    });
+
+    if (!location || location.warehouseId !== payload.warehouseId) {
+      return { ok: false as const, reason: "Reservation location is invalid for the selected warehouse." };
+    }
+
+    const onHand = await getItemLocationOnHand(itemId, payload.warehouseId, payload.locationId);
+    const reserved = await getActiveReservedQuantity(itemId, payload.warehouseId, payload.locationId);
+    if (onHand - reserved < payload.quantity) {
+      return { ok: false as const, reason: "Reservation quantity exceeds available stock at the selected location." };
+    }
+  }
+
+  await prisma.inventoryReservation.create({
+    data: {
+      itemId,
+      warehouseId: payload.warehouseId,
+      locationId: payload.locationId,
+      sourceType: "MANUAL",
+      sourceId: null,
+      quantity: payload.quantity,
+      status: "ACTIVE",
+      notes: payload.notes,
+    },
+  });
+
+  const nextDetail = await getInventoryItemById(itemId);
+  return nextDetail ? { ok: true as const, item: nextDetail } : { ok: false as const, reason: "Unable to load updated inventory item." };
+}
+
 export async function createInventoryItem(payload: InventoryItemInput) {
   const validatedBom = await validateBomLines(null, payload.bomLines);
   if (!validatedBom.ok) {

server/src/modules/manufacturing/service.ts

@@ -366,6 +366,10 @@ function addMinutes(value: Date, minutes: number) {
   return new Date(value.getTime() + minutes * 60 * 1000);
 }
 
+function shouldReserveForStatus(status: string) {
+  return status === "RELEASED" || status === "IN_PROGRESS" || status === "ON_HOLD";
+}
+
 function buildWorkOrderOperationPlan(
   itemOperations: WorkOrderRecord["item"]["operations"],
   quantity: number,
@@ -463,6 +467,46 @@ async function regenerateWorkOrderOperations(workOrderId: string) {
   });
 }
 
+async function syncWorkOrderReservations(workOrderId: string) {
+  const workOrder = await getWorkOrderById(workOrderId);
+  if (!workOrder) {
+    return;
+  }
+
+  await prisma.inventoryReservation.deleteMany({
+    where: {
+      workOrderId,
+      sourceType: "WORK_ORDER",
+    },
+  });
+
+  if (!shouldReserveForStatus(workOrder.status)) {
+    return;
+  }
+
+  const reservations = workOrder.materialRequirements
+    .filter((requirement) => requirement.remainingQuantity > 0)
+    .map((requirement) => ({
+      itemId: requirement.componentItemId,
+      warehouseId: workOrder.warehouseId,
+      locationId: workOrder.locationId,
+      workOrderId,
+      sourceType: "WORK_ORDER",
+      sourceId: workOrderId,
+      quantity: requirement.remainingQuantity,
+      status: "ACTIVE",
+      notes: `${workOrder.workOrderNumber} component demand`,
+    }));
+
+  if (reservations.length === 0) {
+    return;
+  }
+
+  await prisma.inventoryReservation.createMany({
+    data: reservations,
+  });
+}
+
 async function nextWorkOrderNumber() {
   const next = (await workOrderModel.count()) + 1;
   return `WO-${String(next).padStart(5, "0")}`;
@@ -696,6 +740,7 @@ export async function createWorkOrder(payload: WorkOrderInput) {
   });
 
   await regenerateWorkOrderOperations(created.id);
+  await syncWorkOrderReservations(created.id);
 
   const workOrder = await getWorkOrderById(created.id);
   return workOrder ? { ok: true as const, workOrder } : { ok: false as const, reason: "Unable to load saved work order." };
@@ -738,6 +783,7 @@ export async function updateWorkOrder(workOrderId: string, payload: WorkOrderInp
   });
 
   await regenerateWorkOrderOperations(workOrderId);
+  await syncWorkOrderReservations(workOrderId);
 
   const workOrder = await getWorkOrderById(workOrderId);
   return workOrder ? { ok: true as const, workOrder } : { ok: false as const, reason: "Unable to load saved work order." };
@@ -773,6 +819,8 @@ export async function updateWorkOrderStatus(workOrderId: string, status: WorkOrd
     },
   });
 
+  await syncWorkOrderReservations(workOrderId);
+
   const workOrder = await getWorkOrderById(workOrderId);
   return workOrder ? { ok: true as const, workOrder } : { ok: false as const, reason: "Unable to load saved work order." };
 }
@@ -859,6 +907,8 @@ export async function issueWorkOrderMaterial(workOrderId: string, payload: WorkO
     });
   });
 
+  await syncWorkOrderReservations(workOrderId);
+
   const nextWorkOrder = await getWorkOrderById(workOrderId);
   return nextWorkOrder ? { ok: true as const, workOrder: nextWorkOrder } : { ok: false as const, reason: "Unable to load updated work order." };
 }
@@ -917,6 +967,8 @@ export async function recordWorkOrderCompletion(workOrderId: string, payload: Wo
     });
   });
 
+  await syncWorkOrderReservations(workOrderId);
+
   const nextWorkOrder = await getWorkOrderById(workOrderId);
   return nextWorkOrder ? { ok: true as const, workOrder: nextWorkOrder } : { ok: false as const, reason: "Unable to load updated work order." };
 }

shared/src/inventory/types.ts

@@ -2,11 +2,13 @@ export const inventoryItemTypes = ["PURCHASED", "MANUFACTURED", "ASSEMBLY", "SER
 export const inventoryItemStatuses = ["DRAFT", "ACTIVE", "OBSOLETE"] as const;
 export const inventoryUnitsOfMeasure = ["EA", "FT", "IN", "LB", "KG", "SET"] as const;
 export const inventoryTransactionTypes = ["RECEIPT", "ISSUE", "ADJUSTMENT_IN", "ADJUSTMENT_OUT"] as const;
+export const inventoryReservationStatuses = ["ACTIVE", "RELEASED", "CONSUMED"] as const;
 
 export type InventoryItemType = (typeof inventoryItemTypes)[number];
 export type InventoryItemStatus = (typeof inventoryItemStatuses)[number];
 export type InventoryUnitOfMeasure = (typeof inventoryUnitsOfMeasure)[number];
 export type InventoryTransactionType = (typeof inventoryTransactionTypes)[number];
+export type InventoryReservationStatus = (typeof inventoryReservationStatuses)[number];
 
 export interface InventoryBomLineDto {
   id: string;
@@ -121,6 +123,8 @@ export interface InventoryStockBalanceDto {
   locationCode: string;
   locationName: string;
   quantityOnHand: number;
+  quantityReserved: number;
+  quantityAvailable: number;
 }
 
 export interface InventoryTransactionDto {
@@ -149,6 +153,59 @@ export interface InventoryTransactionInput {
   notes: string;
 }
 
+export interface InventoryTransferDto {
+  id: string;
+  quantity: number;
+  notes: string;
+  createdAt: string;
+  createdByName: string;
+  fromWarehouseId: string;
+  fromWarehouseCode: string;
+  fromWarehouseName: string;
+  fromLocationId: string;
+  fromLocationCode: string;
+  fromLocationName: string;
+  toWarehouseId: string;
+  toWarehouseCode: string;
+  toWarehouseName: string;
+  toLocationId: string;
+  toLocationCode: string;
+  toLocationName: string;
+}
+
+export interface InventoryTransferInput {
+  quantity: number;
+  fromWarehouseId: string;
+  fromLocationId: string;
+  toWarehouseId: string;
+  toLocationId: string;
+  notes: string;
+}
+
+export interface InventoryReservationDto {
+  id: string;
+  quantity: number;
+  status: InventoryReservationStatus;
+  sourceType: string;
+  sourceId: string | null;
+  sourceLabel: string | null;
+  notes: string;
+  createdAt: string;
+  warehouseId: string | null;
+  warehouseCode: string | null;
+  warehouseName: string | null;
+  locationId: string | null;
+  locationCode: string | null;
+  locationName: string | null;
+}
+
+export interface InventoryReservationInput {
+  quantity: number;
+  warehouseId: string | null;
+  locationId: string | null;
+  notes: string;
+}
+
 export interface InventoryItemDetailDto extends InventoryItemSummaryDto {
   description: string;
   defaultCost: number | null;
@@ -158,8 +215,12 @@ export interface InventoryItemDetailDto extends InventoryItemSummaryDto {
   bomLines: InventoryBomLineDto[];
   operations: InventoryItemOperationDto[];
   onHandQuantity: number;
+  reservedQuantity: number;
+  availableQuantity: number;
   stockBalances: InventoryStockBalanceDto[];
   recentTransactions: InventoryTransactionDto[];
+  transfers: InventoryTransferDto[];
+  reservations: InventoryReservationDto[];
 }
 
 export interface InventoryItemInput {