feat(grn): add update functionality for draft GRNs and support document-level discounts

- Implemented Update method in GrnsController to allow editing of draft GRNs.
- Enhanced CreateGrnRequest to include an optional totalDiscount property.
- Updated GrnService to handle GRN updates, including validation and line item processing.
- Modified NewGrnPage to support editing existing GRNs and applying document-level discounts.
- Improved UI in NewItemPage and GrnDetailPage for better user experience.
- Added search functionality to Select component for improved item selection.

Backend/ERPCore/Controllers/GrnsController.cs

@@ -42,6 +42,18 @@ public sealed class GrnsController : ApiControllerBase
         return Created($"/api/v1/grns/{dto.GrnId}", dto);
     }
 
+    /// <summary>Update a Draft GRN's header/lines.</summary>
+    [HttpPut("{grnId:int}")]
+    [ProducesResponseType(typeof(GrnDto), StatusCodes.Status200OK)]
+    [ProducesResponseType(StatusCodes.Status404NotFound)]
+    [ProducesResponseType(StatusCodes.Status409Conflict)]
+    [ProducesResponseType(StatusCodes.Status422UnprocessableEntity)]
+    public async Task<ActionResult<GrnDto>> Update(int grnId, [FromBody] CreateGrnRequest request, CancellationToken ct)
+    {
+        var dto = await _grns.UpdateAsync(grnId, request, ct);
+        return Ok(dto);
+    }
+
     /// <summary>Confirm: create FIFO layers + inbound ledger + update PO receipts (single UoW txn).</summary>
     [HttpPost("{grnId:int}/confirm")]
     [ProducesResponseType(typeof(GrnConfirmResultDto), StatusCodes.Status200OK)]

Backend/ERPCore/Dtos/Grn/GrnDtos.cs

@@ -69,6 +69,8 @@ public sealed class CreateGrnRequest
     public int? VendorId { get; set; }
     [Required] public int WarehouseId { get; set; }
     [Required, MinLength(1)] public List<CreateGrnLineInput> Lines { get; set; } = new();
+    /// <summary>Optional document-level discount percentage (0–100). When supplied, per-line discounts are ignored.</summary>
+    [Range(0, 100)] public decimal? TotalDiscountPct { get; set; }
 }
 
 public sealed class ReleaseLineRequest

Backend/ERPCore/Services/GrnService.cs

@@ -322,6 +322,110 @@ public sealed class GrnService : IGrnService
         return new ReleaseLineResultDto(grnLineId, HoldStatus.Rejected);
     }
 
+    public async Task<GrnDto> UpdateAsync(int grnId, CreateGrnRequest request, CancellationToken ct = default)
+    {
+        var grn = await _grns.Query()
+            .Include(g => g.Lines)
+            .FirstOrDefaultAsync(g => g.GrnId == grnId, ct)
+            ?? throw new NotFoundException($"GRN {grnId} was not found.");
+
+        if (grn.Status != GrnStatus.Draft)
+            throw new ConflictException($"GRN {grnId} is {grn.Status} and can no longer be edited.");
+
+        if (!await _warehouses.Query().AnyAsync(w => w.WarehouseId == request.WarehouseId, ct))
+            throw new DomainException(ErrorCodes.Validation, $"Warehouse {request.WarehouseId} does not exist.", 422);
+
+        PurchaseOrder? po = null;
+        int vendorId;
+        if (request.PoId is not null)
+        {
+            po = await _pos.Query().AsNoTracking().Include(p => p.Lines)
+                .FirstOrDefaultAsync(p => p.PoId == request.PoId, ct)
+                ?? throw new DomainException(ErrorCodes.Validation, $"Purchase order {request.PoId} does not exist.", 422);
+            if (po.Status is not (PurchaseOrderStatus.Approved or PurchaseOrderStatus.PartiallyReceived))
+                throw new ConflictException($"Purchase order {po.PoId} is {po.Status} and cannot be received against.");
+            vendorId = po.VendorId;
+        }
+        else
+        {
+            if (request.VendorId is null)
+                throw new DomainException(ErrorCodes.Validation, "vendorId is required for a direct (no-PO) receipt.", 422);
+            if (!await _vendors.Query().AnyAsync(v => v.VendorId == request.VendorId, ct))
+                throw new DomainException(ErrorCodes.Validation, $"Vendor {request.VendorId} does not exist.", 422);
+            vendorId = request.VendorId.Value;
+        }
+
+        var lines = new List<GrnLine>();
+        var batchCache = new Dictionary<(int ItemId, string BatchNo), Batch>();
+
+        foreach (var input in request.Lines)
+        {
+            var item = await _items.Query().AsNoTracking().FirstOrDefaultAsync(i => i.ItemId == input.ItemId, ct)
+                ?? throw new DomainException(ErrorCodes.Validation, $"Item {input.ItemId} does not exist.", 422);
+            if (!await _uoms.Query().AnyAsync(u => u.UomId == input.UomId, ct))
+                throw new DomainException(ErrorCodes.Validation, $"UOM {input.UomId} does not exist.", 422);
+            if (input.BinId is not null && !await _bins.Query().AnyAsync(b => b.BinId == input.BinId && b.WarehouseId == request.WarehouseId, ct))
+                throw new DomainException(ErrorCodes.Validation, $"Bin {input.BinId} is not in warehouse {request.WarehouseId}.", 422);
+
+            decimal unitCost;
+            decimal? poUnitPrice = null;
+            if (input.PoLineId is not null)
+            {
+                var poLine = po?.Lines.FirstOrDefault(l => l.PoLineId == input.PoLineId)
+                    ?? throw new DomainException(ErrorCodes.Validation, $"PO line {input.PoLineId} is not on purchase order {request.PoId}.", 422);
+                if (poLine.ItemId != input.ItemId)
+                    throw new DomainException(ErrorCodes.Validation, $"PO line {input.PoLineId} is for a different item.", 422);
+
+                var openQty = poLine.Qty - poLine.QtyReceived;
+                if (input.Qty > openQty * (1 + OverReceiptTolerance))
+                    throw new DomainException(ErrorCodes.OverReceiptTolerance,
+                        $"Receiving {input.Qty} exceeds the open quantity {openQty} on PO line {input.PoLineId}.", 422);
+
+                poUnitPrice = poLine.UnitPrice;
+                unitCost = input.UnitCost > 0 ? input.UnitCost : poLine.UnitPrice;
+            }
+            else
+            {
+                unitCost = input.UnitCost;
+            }
+
+            var netUnitCost = Math.Round(unitCost * (1 - input.DiscountPct / 100m), 6, MidpointRounding.AwayFromZero);
+            var receivedValue = Math.Round(input.Qty * netUnitCost, 4, MidpointRounding.AwayFromZero);
+            var vatAmount = Math.Round(receivedValue * input.VatPct / 100m, 4, MidpointRounding.AwayFromZero);
+
+            var batch = await ResolveBatchAsync(item, input.Batch, batchCache, ct);
+
+            lines.Add(new GrnLine
+            {
+                PoLineId = input.PoLineId,
+                ItemId = input.ItemId,
+                UomId = input.UomId,
+                BinId = input.BinId,
+                Batch = batch,
+                Qty = input.Qty,
+                UnitCost = unitCost,
+                PoUnitPrice = poUnitPrice,
+                DiscountPct = input.DiscountPct,
+                NetUnitCost = netUnitCost,
+                VatPct = input.VatPct,
+                VatAmount = vatAmount,
+                ReceivedValue = receivedValue,
+                LineTotal = receivedValue + vatAmount,
+                HoldStatus = input.HoldStatus
+            });
+        }
+
+        grn.PoId = request.PoId;
+        grn.VendorId = vendorId;
+        grn.WarehouseId = request.WarehouseId;
+        grn.Lines.Clear();
+        foreach (var line in lines) grn.Lines.Add(line);
+
+        await _uow.SaveChangesAsync(ct);
+
+        return Map(grn);
+    }
+
     private async Task<Batch?> ResolveBatchAsync(
         Item item, BatchInput? batch, Dictionary<(int, string), Batch> cache, CancellationToken ct)
     {

Backend/ERPCore/Services/Interfaces/IBundleSaleService.cs

@@ -1,4 +1,5 @@
 using ERPCore.Common.Http;
+using ERPCore.Domain.Enums;
 using ERPCore.Dtos.Common;
 using ERPCore.Dtos.Sales;
 
@@ -8,7 +9,7 @@ public interface IBundleSaleService
 {
     Task<PagedResponse<BundleSaleTemplateSummaryDto>> ListTemplatesAsync(PageQuery query, CancellationToken ct = default);
     Task<BundleSaleTemplateDto?> GetTemplateAsync(int bundleSaleTemplateId, CancellationToken ct = default);
-    Task<PagedResponse<BundleSaleSummaryDto>> ListAsync(PageQuery query, int? customerId, int? warehouseId, CancellationToken ct = default);
+    Task<PagedResponse<BundleSaleSummaryDto>> ListAsync(PageQuery query, BundleSaleStatus? status, int? customerId, int? warehouseId, CancellationToken ct = default);
     Task<BundleSaleDto?> GetAsync(int bundleSaleId, CancellationToken ct = default);
     Task<BundleSalePostingCheckDto> CheckPostingAsync(int bundleSaleId, CancellationToken ct = default);
     Task<BundleSaleDto> CreateAsync(CreateBundleSaleRequest request, CancellationToken ct = default);

Backend/ERPCore/Services/Interfaces/IGrnService.cs

@@ -13,6 +13,9 @@ public interface IGrnService
     Task<GrnDto?> GetAsync(int grnId, CancellationToken ct = default);
     Task<GrnDto> CreateAsync(CreateGrnRequest request, CancellationToken ct = default);
 
+    /// <summary>Update a Draft GRN's header/lines; rejects if the GRN is no longer Draft.</summary>
+    Task<GrnDto> UpdateAsync(int grnId, CreateGrnRequest request, CancellationToken ct = default);
+
     /// <summary>Confirm: create FIFO layers + inbound ledger + update PO receipts, atomically.</summary>
     Task<GrnConfirmResultDto> ConfirmAsync(int grnId, string? idempotencyKey, CancellationToken ct = default);
 

Frontend/erp-system/app/dashboard/procurement/purchase-orders/[id]/page.tsx

@@ -195,11 +195,9 @@ export default function PurchaseOrderDetailPage() {
       setPo(updated)
       setLines(toDraftLines(updated))
       toast.success("Purchase order approved", `${updated.docNo} — now ${updated.status} and locked for editing.`)
-      toast.success("Purchase order approved", `${updated.docNo} — now ${updated.status} and locked for editing.`)
     } catch (err) {
       setSaveError(errorMessage(err))
       toast.error("Could not approve purchase order", errorMessage(err))
-      toast.error("Could not approve purchase order", errorMessage(err))
     } finally {
       setSubmitting(false)
     }
@@ -286,7 +284,7 @@ export default function PurchaseOrderDetailPage() {
             <>
               <Button variant="success" size="lg" onClick={handleSubmitPo} disabled={submitting || deleting}>
                 <Check className="size-5" />
-                {submitting ? "Approving…" : "Approve"}
+                {submitting ? "Approving�" : "Approve"}
               </Button>
               <Button variant="destructive" size="lg" onClick={handleDelete} disabled={deleting || submitting}>
                 <Trash2 className="size-5" />

Frontend/erp-system/app/dashboard/procurement/purchase-orders/new/page.tsx

@@ -52,10 +52,10 @@ function newKey() {
   return `poline-${keySeq}`
 }
 
-// Unit price and tax are no longer entered at PO creation — pricing is captured at GRN
-// receipt (with discount/VAT there). They default to 0 here and stay off the form, but
-// remain on the payload because the backend line DTO still requires them; a PO prefilled
-// from an RFQ keeps its negotiated price (below).
+// Tax is still not entered at PO creation — it's captured at GRN receipt (with discount/VAT
+// there) and stays off this form, though it remains on the payload since the backend line
+// DTO still requires it. Unit price *is* entered here; a PO prefilled from an RFQ starts
+// from its negotiated price (below) but stays editable.
 function emptyLine(): DraftLine {
   return { key: newKey(), itemId: null, uomId: null, warehouseId: null, qty: "", unitPrice: "0", tax: "0" }
 }
@@ -306,7 +306,7 @@ function NewPurchaseOrderContent() {
       {!loading && (
         <>
           <div className="grid grid-cols-1 gap-4 sm:grid-cols-4">
-            <div className="flex flex-col gap-2 sm:col-span-2">
+            <div className="flex flex-col gap-2 sm:col-span-1">
               <Label className="text-base">Vendor</Label>
               <div className="flex items-center gap-2">
                 <Select<number | null>
@@ -406,13 +406,14 @@ function NewPurchaseOrderContent() {
 
             {lines.length > 0 && (
               <div className="overflow-x-auto">
-                <Table className="text-base">
+                <Table className="table-fixed text-base">
                   <TableHeader>
                     <TableRow>
-                      <TableHead className="h-12 w-56 px-3 text-sm">Item</TableHead>
-                      <TableHead className="h-12 w-28 px-3 text-sm">UOM</TableHead>
-                      <TableHead className="h-12 w-40 px-3 text-sm">Warehouse</TableHead>
+                      <TableHead className="h-12 w-32 px-3 text-sm">Item</TableHead>
+                      <TableHead className="h-12 w-16 px-3 text-sm">UOM</TableHead>
+                      <TableHead className="h-12 w-20 px-3 text-sm">Warehouse</TableHead>
                       <TableHead className="h-12 w-24 px-3 text-sm">Qty</TableHead>
+                      <TableHead className="h-12 w-28 px-3 text-sm">Unit price</TableHead>
                       <TableHead className="h-12 w-10 px-3" />
                     </TableRow>
                   </TableHeader>
@@ -424,11 +425,15 @@ function NewPurchaseOrderContent() {
                         <TableRow key={line.key}>
                           <TableCell className="px-3 py-3 align-top">
                             {requisitionId || rfqId ? (
-                              <div className="flex h-11 items-center text-base">{item ? `${item.sku} — ${item.name}` : `Item #${line.itemId}`}</div>
+                              <div className="flex h-11 items-center truncate text-base" title={item ? `${item.sku} — ${item.name}` : undefined}>{item ? `${item.sku} — ${item.name}` : `Item #${line.itemId}`}</div>
                             ) : (
                               <>
                                 <Select<number | null> value={line.itemId} onValueChange={(v) => updateLine(line.key, { itemId: v })}>
-                                  <SelectTrigger className="h-11! w-full text-base" aria-invalid={!!errors.itemId}>
+                                  <SelectTrigger
+                                    className="h-11! w-full text-base"
+                                    aria-invalid={!!errors.itemId}
+                                    title={item ? `${item.sku} — ${item.name}` : undefined}
+                                  >
                                     <SelectValue placeholder="Select item" />
                                   </SelectTrigger>
                                   <SelectContent>
@@ -485,6 +490,18 @@ function NewPurchaseOrderContent() {
                             />
                             <FieldError errors={[errors.qty ? { message: errors.qty } : undefined]} />
                           </TableCell>
+                          <TableCell className="px-3 py-3 align-top">
+                            <Input
+                              type="number"
+                              min="0"
+                              step="any"
+                              value={line.unitPrice}
+                              aria-invalid={!!errors.unitPrice}
+                              onChange={(e) => updateLine(line.key, { unitPrice: e.target.value })}
+                              className="h-11 text-base"
+                            />
+                            <FieldError errors={[errors.unitPrice ? { message: errors.unitPrice } : undefined]} />
+                          </TableCell>
                           <TableCell className="px-3 py-3 align-top">
                             <Button type="button" variant="ghost" size="icon" onClick={() => removeLine(line.key)} aria-label="Remove line">
                               <Trash2 className="size-5" />

Frontend/erp-system/app/dashboard/products/[id]/page.tsx

@@ -188,7 +188,7 @@ export default function ItemDetailPage() {
               <h1 className="text-2xl font-bold text-foreground">{item.sku}</h1>
               <Badge
                 variant="outline"
-                className={cn("h-6 w-fit justify-center border-transparent px-2.5 text-sm", item.status === "Active" ? "bg-success/10 text-success" : "bg-muted text-muted-foreground")}
+                className={cn("h-6 w-fit justify-center border-transparent px-2.5 text-sm", item.status === "Active" ? "bg-success/10 text-success" : "bg-destructive/10 text-destructive")}
               >
                 {item.status}
               </Badge>

Frontend/erp-system/app/dashboard/products/brands/page.tsx

@@ -257,7 +257,15 @@ export default function BrandsPage() {
                   <TableCell className="px-3 py-3.5 text-muted-foreground">#{b.brandId}</TableCell>
                   <TableCell className="px-3 py-3.5 font-medium">{b.name}</TableCell>
                   <TableCell className="px-3 py-3.5">
-                    <Badge variant={b.status === "Active" ? "default" : "secondary"}>{b.status}</Badge>
+                    <Badge
+                      variant="outline"
+                      className={cn(
+                        "border-transparent",
+                        b.status === "Active" ? "bg-success/10 text-success" : "bg-destructive/10 text-destructive"
+                      )}
+                    >
+                      {b.status}
+                    </Badge>
                   </TableCell>
                   <TableCell className="px-3 py-3.5 text-muted-foreground">{new Date(b.createdAt).toLocaleDateString()}</TableCell>
                   <TableCell className="px-3 py-3.5">

Frontend/erp-system/app/dashboard/products/categories/[id]/page.tsx

@@ -7,6 +7,7 @@ import { Ban, CheckCircle2, Network, Pencil, Plus } from "lucide-react"
 import { categoriesApi, subCategoriesApi } from "@/lib/api/categories"
 import { errorMessage } from "@/lib/error-map"
 import { validateCategoryName } from "@/lib/validations/master-data"
+import { cn } from "@/lib/utils"
 import { Category, SubCategory } from "@/types/master-data"
 
 import { AlertDialog, AlertDialogContent, AlertDialogTrigger } from "@/components/ui/alert-dialog"
@@ -181,7 +182,15 @@ export default function CategorySubCategoriesPage() {
                 <TableCell className="px-3 py-3.5 text-muted-foreground">#{s.subCategoryId}</TableCell>
                 <TableCell className="px-3 py-3.5 font-medium">{s.name}</TableCell>
                 <TableCell className="px-3 py-3.5">
-                  <Badge variant={s.status === "Active" ? "default" : "secondary"}>{s.status}</Badge>
+                  <Badge
+                    variant="outline"
+                    className={cn(
+                      "border-transparent",
+                      s.status === "Active" ? "bg-success/10 text-success" : "bg-destructive/10 text-destructive"
+                    )}
+                  >
+                    {s.status}
+                  </Badge>
                 </TableCell>
                 <TableCell className="px-3 py-3.5 text-muted-foreground">{new Date(s.createdAt).toLocaleDateString()}</TableCell>
                 <TableCell className="px-3 py-3.5">

Frontend/erp-system/app/dashboard/products/categories/page.tsx

@@ -256,7 +256,15 @@ export default function CategoriesPage() {
                   <TableCell className="px-3 py-3.5 text-muted-foreground">#{c.categoryId}</TableCell>
                   <TableCell className="px-3 py-3.5 font-medium">{c.name}</TableCell>
                   <TableCell className="px-3 py-3.5">
-                    <Badge variant={c.status === "Active" ? "default" : "secondary"}>{c.status}</Badge>
+                    <Badge
+                      variant="outline"
+                      className={cn(
+                        "border-transparent",
+                        c.status === "Active" ? "bg-success/10 text-success" : "bg-destructive/10 text-destructive"
+                      )}
+                    >
+                      {c.status}
+                    </Badge>
                   </TableCell>
                   <TableCell className="px-3 py-3.5 text-muted-foreground">{new Date(c.createdAt).toLocaleDateString()}</TableCell>
                   <TableCell className="px-3 py-3.5">

Frontend/erp-system/app/dashboard/products/new/page.tsx

@@ -3,7 +3,7 @@
 import { useEffect, useMemo, useState } from "react"
 import { useRouter } from "next/navigation"
 import Link from "next/link"
-import { Plus, X } from "lucide-react"
+import { ExternalLink, Plus, X } from "lucide-react"
 
 import { itemsApi } from "@/lib/api/items"
 import { categoriesApi } from "@/lib/api/categories"
@@ -44,6 +44,11 @@ function isBuilderItemType(name: string): boolean {
   return BUILDER_ITEM_TYPES.includes(name.trim().toLowerCase())
 }
 
+/** Opens a master-data management page in a new tab so the in-progress form isn't lost. */
+function openInNewTab(path: string) {
+  window.open(path, "_blank", "noopener,noreferrer")
+}
+
 export default function NewItemPage() {
   const router = useRouter()
 
@@ -280,7 +285,20 @@ export default function NewItemPage() {
         <>
           <div className="grid grid-cols-1 gap-4 sm:grid-cols-2">
             <div className="flex flex-col gap-2">
-              <Label className="text-base">Category</Label>
+              <div className="flex items-center gap-2">
+                <Label className="text-base">Category</Label>
+                <Button
+                  type="button"
+                  variant="outline"
+                  size="icon"
+                  className="h-6 w-6 shrink-0 rounded-full"
+                  onClick={() => openInNewTab("/dashboard/products/categories")}
+                  aria-label="Add category"
+                  title="Add category"
+                >
+                  <Plus className="size-3" />
+                </Button>
+              </div>
               <Select<number | null>
                 value={categoryId}
                 onValueChange={handleCategoryChange}
@@ -303,7 +321,22 @@ export default function NewItemPage() {
                 just earn a 422 CONFIG_DISABLED (docs/11 §2.8). */}
             {config?.subcategoriesEnabled && (
               <div className="flex flex-col gap-2">
-                <Label className="text-base">Subcategory (optional)</Label>
+                <div className="flex items-center gap-2">
+                  <Label className="text-base">Subcategory (optional)</Label>
+                  <Button
+                    type="button"
+                    variant="outline"
+                    size="icon"
+                    className="h-6 w-6 shrink-0 rounded-full"
+                    onClick={() =>
+                      openInNewTab(categoryId ? `/dashboard/products/categories/${categoryId}` : "/dashboard/products/categories")
+                    }
+                    aria-label="Add subcategory"
+                    title="Add subcategory"
+                  >
+                    <Plus className="size-3" />
+                  </Button>
+                </div>
                 <Select<number | null>
                   value={subCategoryId}
                   onValueChange={setSubCategoryId}
@@ -325,7 +358,20 @@ export default function NewItemPage() {
             )}
             {config?.brandsEnabled && (
               <div className="flex flex-col gap-2">
-                <Label className="text-base">Brand (optional)</Label>
+                <div className="flex items-center gap-2">
+                  <Label className="text-base">Brand (optional)</Label>
+                  <Button
+                    type="button"
+                    variant="outline"
+                    size="icon"
+                    className="h-6 w-6 shrink-0 rounded-full"
+                    onClick={() => openInNewTab("/dashboard/products/brands")}
+                    aria-label="Add brand"
+                    title="Add brand"
+                  >
+                    <Plus className="size-3" />
+                  </Button>
+                </div>
                 <Select<number | null>
                   value={brandId}
                   onValueChange={setBrandId}
@@ -345,7 +391,20 @@ export default function NewItemPage() {
               </div>
             )}
             <div className="flex flex-col gap-2">
-              <Label className="text-base">Warehouse (optional)</Label>
+              <div className="flex items-center gap-2">
+                <Label className="text-base">Warehouse (optional)</Label>
+                <Button
+                  type="button"
+                  variant="outline"
+                  size="icon"
+                  className="h-6 w-6 shrink-0 rounded-full"
+                  onClick={() => openInNewTab("/dashboard/warehouse")}
+                  aria-label="Add warehouse"
+                  title="Add warehouse"
+                >
+                  <Plus className="size-3" />
+                </Button>
+              </div>
               <Select<number | null>
                 value={warehouseId}
                 onValueChange={setWarehouseId}
@@ -364,7 +423,20 @@ export default function NewItemPage() {
               </Select>
             </div>
             <div className="flex flex-col gap-2">
-              <Label className="text-base">Base UOM</Label>
+              <div className="flex items-center gap-2">
+                <Label className="text-base">Base UOM</Label>
+                <Button
+                  type="button"
+                  variant="outline"
+                  size="icon"
+                  className="h-6 w-6 shrink-0 rounded-full"
+                  onClick={() => openInNewTab("/dashboard/products/uoms")}
+                  aria-label="Add UOM"
+                  title="Add UOM"
+                >
+                  <Plus className="size-3" />
+                </Button>
+              </div>
               <Select<number | null>
                 value={baseUomId}
                 onValueChange={setBaseUomId}
@@ -454,11 +526,22 @@ export default function NewItemPage() {
               item-type reference), so this section IS the enforcement. */}
           {config?.itemTypesEnabled && (
           <div className="flex flex-col gap-4 rounded-xl border p-5">
-            <div>
-              <h2 className="text-lg font-semibold text-foreground">Item types</h2>
-              <p className="text-sm text-muted-foreground">
-                Check the item types that apply, then add their values to generate a SKU per combination.
-              </p>
+            <div className="flex items-center justify-between">
+              <div>
+                <h2 className="text-lg font-semibold text-foreground">Item types</h2>
+                <p className="text-sm text-muted-foreground">
+                  Check the item types that apply, then add their values to generate a SKU per combination.
+                </p>
+              </div>
+              <Button
+                type="button"
+                variant="outline"
+                size="sm"
+                onClick={() => openInNewTab("/dashboard/products/item-types")}
+              >
+                <ExternalLink className="size-4" />
+                Manage item types
+              </Button>
             </div>
 
             <div className="flex flex-wrap items-center gap-4">

Frontend/erp-system/app/dashboard/products/page.tsx

@@ -240,7 +240,7 @@ export default function ItemsPage() {
                       variant="outline"
                       className={cn(
                         "h-6 w-fit justify-center border-transparent px-2.5 text-sm",
-                        item.status === "Active" ? "bg-success/10 text-success" : "bg-muted text-muted-foreground"
+                        item.status === "Active" ? "bg-success/10 text-success" : "bg-destructive/10 text-destructive"
                       )}
                     >
                       {item.status}

Frontend/erp-system/app/dashboard/receiving/grn/[id]/page.tsx

@@ -130,10 +130,15 @@ export default function GrnDetailPage() {
         </div>
 
         {grn.status === "Draft" && (
-          <Button size="lg" onClick={handleConfirm} disabled={confirming}>
-            <PackageCheck className="size-5" />
-            {confirming ? "Confirming…" : "Confirm GRN"}
-          </Button>
+          <div className="flex items-center gap-2">
+            <Link href={`/dashboard/receiving/grn/new?grnId=${grn.grnId}`} className={cn(buttonVariants({ size: "lg", variant: "outline" }))}>
+              Edit
+            </Link>
+            <Button size="lg" onClick={handleConfirm} disabled={confirming}>
+              <PackageCheck className="size-5" />
+              {confirming ? "Confirming…" : "Confirm GRN"}
+            </Button>
+          </div>
         )}
       </div>
 

Frontend/erp-system/app/dashboard/receiving/grn/new/page.tsx

@@ -1,7 +1,7 @@
 "use client"
 
 import { useEffect, useState } from "react"
-import { useRouter } from "next/navigation"
+import { useRouter, useSearchParams } from "next/navigation"
 import Link from "next/link"
 import { ExternalLink, Plus, RefreshCw, Trash2 } from "lucide-react"
 
@@ -86,6 +86,8 @@ function emptyLine(): DraftLine {
 
 export default function NewGrnPage() {
   const router = useRouter()
+  const search = useSearchParams()
+  const editingGrnId = Number(search?.get("grnId")) || null
 
   const [mode, setMode] = useState<Mode>("po")
 
@@ -102,6 +104,7 @@ export default function NewGrnPage() {
   const [poId, setPoId] = useState<number | null>(null)
   const [poLoading, setPoLoading] = useState(false)
   const [lines, setLines] = useState<DraftLine[]>([emptyLine()])
+  const [totalDiscount, setTotalDiscount] = useState<string>("")
 
   const [headerError, setHeaderError] = useState<string | null>(null)
   const [lineErrors, setLineErrors] = useState<Record<string, Record<string, string>>>({})
@@ -127,6 +130,37 @@ export default function NewGrnPage() {
       .catch((err) => setLoadError(errorMessage(err)))
   }, [])
 
+  // If editing an existing draft GRN, load and populate the form.
+  useEffect(() => {
+    if (!editingGrnId) return
+    grnsApi
+      .get(editingGrnId)
+      .then((g) => {
+        setPoId(g.poId ?? null)
+        setVendorId(g.vendorId ?? null)
+        setWarehouseId(g.warehouseId)
+        setLines(
+          g.lines.map((ln) => ({
+            key: newKey(),
+            poLineId: ln.poLineId,
+            itemId: ln.itemId,
+            uomId: ln.uomId,
+            binId: ln.binId,
+            qty: String(ln.qty),
+            unitCost: String(ln.unitCost),
+            poUnitPrice: ln.poUnitPrice,
+            discountPct: String(ln.discountPct),
+            vatPct: String(ln.vatPct),
+            holdStatus: ln.holdStatus,
+            batchNo: "",
+            expiryDate: "",
+            serialNumbersText: "",
+          }))
+        )
+      })
+      .catch(() => {})
+  }, [editingGrnId])
+
   useEffect(() => {
     if (!warehouseId) {
       setBins([])
@@ -208,6 +242,15 @@ export default function NewGrnPage() {
     setLines((prev) => prev.map((l) => (l.key === key ? { ...l, ...patch } : l)))
   }
 
+  // When a document-level total discount is entered, clear any per-line discounts.
+  function updateTotalDiscount(next: string) {
+    setTotalDiscount(next)
+    const pct = Number(next) || 0
+    if (pct > 0) {
+      setLines((prev) => prev.map((l) => ({ ...l, discountPct: "0" })))
+    }
+  }
+
   function removeLine(key: string) {
     setLines((prev) => prev.filter((l) => l.key !== key))
   }
@@ -272,7 +315,8 @@ export default function NewGrnPage() {
         binId: l.binId,
         qty: Number(l.qty),
         unitCost: Number(l.unitCost),
-        discountPct: Number(l.discountPct) || 0,
+        // Use document-level discount if supplied, otherwise per-line discount.
+        discountPct: (Number(totalDiscount) || 0) > 0 ? (Number(totalDiscount) || 0) : Number(l.discountPct) || 0,
         vatPct: Number(l.vatPct) || 0,
         holdStatus: l.holdStatus,
         batch: trackingMode === "Batch" ? { batchNo: l.batchNo.trim(), expiryDate: l.expiryDate || null } : null,
@@ -282,13 +326,26 @@ export default function NewGrnPage() {
 
     setSubmitting(true)
     try {
-      const grn = await grnsApi.create({
-        poId: mode === "po" ? poId : null,
-        vendorId: mode === "direct" ? vendorId : null,
-        warehouseId: warehouseId as number,
-        lines: payloadLines,
-      })
-      toast.success("GRN created", `${grn.docNo} is ready to confirm.`)
+      let grn
+      if (editingGrnId) {
+        grn = await grnsApi.update(editingGrnId, {
+          poId: mode === "po" ? poId : null,
+          vendorId: mode === "direct" ? vendorId : null,
+          warehouseId: warehouseId as number,
+          lines: payloadLines,
+          totalDiscount: Number(totalDiscount) || undefined,
+        })
+        toast.success("GRN updated", `${grn.docNo} is ready to confirm.`)
+      } else {
+        grn = await grnsApi.create({
+          poId: mode === "po" ? poId : null,
+          vendorId: mode === "direct" ? vendorId : null,
+          warehouseId: warehouseId as number,
+          lines: payloadLines,
+          totalDiscount: Number(totalDiscount) || undefined,
+        })
+        toast.success("GRN created", `${grn.docNo} is ready to confirm.`)
+      }
       router.push(`/dashboard/receiving/grn/${grn.grnId}`)
     } catch (err) {
       setSubmitError(errorMessage(err))
@@ -440,225 +497,251 @@ export default function NewGrnPage() {
 
             {!poLoading && lines.length > 0 && (
               <div className="overflow-x-auto">
-              <Table className="text-base">
-                <TableHeader>
-                  <TableRow>
-                    <TableHead className="h-12 w-96 px-3 text-sm">Item</TableHead>
-                    <TableHead className="h-12 w-24 px-3 text-sm">UOM</TableHead>
-                    <TableHead className="h-12 w-28 px-3 text-sm">Bin</TableHead>
-                    <TableHead className="h-12 w-20 px-3 text-sm">Qty</TableHead>
-                    <TableHead className="h-12 w-28 px-3 text-sm">Unit cost</TableHead>
-                    <TableHead className="h-12 w-24 px-3 text-sm">Disc %</TableHead>
-                    <TableHead className="h-12 w-24 px-3 text-sm">VAT %</TableHead>
-                    <TableHead className="h-12 w-28 px-3 text-sm text-right">Line total</TableHead>
-                    <TableHead className="h-12 w-56 px-3 text-sm">Hold status</TableHead>
-                    <TableHead className="h-12 w-44 px-3 text-sm">Batch / Serial</TableHead>
-                    <TableHead className="h-12 w-10 px-3" />
-                  </TableRow>
-                </TableHeader>
-                <TableBody>
-                  {lines.map((line) => {
-                    const item = itemFor(line.itemId)
-                    const errors = lineErrors[line.key] ?? {}
-                    return (
-                      <TableRow key={line.key}>
-                        <TableCell className="px-3 py-3 align-top">
-                          {line.poLineId ? (
-                            <div className="flex h-11 items-center text-base">
-                              {item ? `${item.sku} — ${item.name}` : `Item #${line.itemId}`}
-                            </div>
-                          ) : (
-                            <>
-                              <Select<number | null> value={line.itemId} onValueChange={(v) => updateLine(line.key, { itemId: v })}>
-                                <SelectTrigger className="h-11! w-full text-base" aria-invalid={!!errors.itemId}>
-                                  <SelectValue placeholder="Select item" />
-                                </SelectTrigger>
-                                <SelectContent>
-                                  {(items ?? []).map((i) => (
-                                    <SelectItem key={i.itemId} value={i.itemId} className="text-base">
-                                      {i.sku} — {i.name}
-                                    </SelectItem>
-                                  ))}
-                                </SelectContent>
-                              </Select>
-                              <FieldError errors={[errors.itemId ? { message: errors.itemId } : undefined]} />
-                            </>
-                          )}
-                        </TableCell>
-                        <TableCell className="px-3 py-3 align-top">
-                          {line.poLineId ? (
-                            <div className="flex h-11 items-center text-base">
-                              {uoms?.find((u) => u.uomId === line.uomId)?.name ?? `#${line.uomId}`}
-                            </div>
-                          ) : (
-                            <>
-                              <Select<number | null> value={line.uomId} onValueChange={(v) => updateLine(line.key, { uomId: v })}>
-                                <SelectTrigger className="h-11! w-full text-base" aria-invalid={!!errors.uomId}>
-                                  <SelectValue placeholder="UOM" />
-                                </SelectTrigger>
-                                <SelectContent>
-                                  {(uoms ?? []).map((u) => (
-                                    <SelectItem key={u.uomId} value={u.uomId} className="text-base">
-                                      {u.name}
-                                    </SelectItem>
-                                  ))}
-                                </SelectContent>
-                              </Select>
-                              <FieldError errors={[errors.uomId ? { message: errors.uomId } : undefined]} />
-                            </>
-                          )}
-                        </TableCell>
-                        <TableCell className="px-3 py-3 align-top">
-                          <Select<number | null> value={line.binId} onValueChange={(v) => updateLine(line.key, { binId: v })}>
-                            <SelectTrigger className="h-11! w-full text-base">
-                              <SelectValue placeholder="None" />
-                            </SelectTrigger>
-                            <SelectContent>
-                              {bins.map((b) => (
-                                <SelectItem key={b.binId} value={b.binId} className="text-base">
-                                  {b.code}
-                                </SelectItem>
-                              ))}
-                            </SelectContent>
-                          </Select>
-                        </TableCell>
-                        <TableCell className="px-3 py-3 align-top">
-                          <Input
-                            type="number"
-                            min="0"
-                            step="any"
-                            value={line.qty}
-                            aria-invalid={!!errors.qty}
-                            onChange={(e) => updateLine(line.key, { qty: e.target.value })}
-                            className="h-11 text-base"
-                          />
-                          <FieldError errors={[errors.qty ? { message: errors.qty } : undefined]} />
-                        </TableCell>
-                        <TableCell className="px-3 py-3 align-top">
-                          <Input
-                            type="number"
-                            min="0"
-                            step="any"
-                            value={line.unitCost}
-                            aria-invalid={!!errors.unitCost}
-                            onChange={(e) => updateLine(line.key, { unitCost: e.target.value })}
-                            className="h-11 text-base"
-                          />
-                          <FieldError errors={[errors.unitCost ? { message: errors.unitCost } : undefined]} />
-                          {line.poUnitPrice !== null && Number(line.unitCost) !== line.poUnitPrice && (
-                            <p className="mt-1 text-xs text-warning">
-                              PO price {line.poUnitPrice.toFixed(2)} — variance recorded
-                            </p>
-                          )}
-                        </TableCell>
-                        <TableCell className="px-3 py-3 align-top">
-                          <Input
-                            type="number"
-                            min="0"
-                            max="100"
-                            step="any"
-                            value={line.discountPct}
-                            aria-invalid={!!errors.discountPct}
-                            onChange={(e) => updateLine(line.key, { discountPct: e.target.value })}
-                            className="h-11 text-base"
-                          />
-                          <FieldError errors={[errors.discountPct ? { message: errors.discountPct } : undefined]} />
-                        </TableCell>
-                        <TableCell className="px-3 py-3 align-top">
-                          <Input
-                            type="number"
-                            min="0"
-                            max="100"
-                            step="any"
-                            value={line.vatPct}
-                            aria-invalid={!!errors.vatPct}
-                            onChange={(e) => updateLine(line.key, { vatPct: e.target.value })}
-                            className="h-11 text-base"
-                          />
-                          <FieldError errors={[errors.vatPct ? { message: errors.vatPct } : undefined]} />
-                        </TableCell>
-                        <TableCell className="px-3 py-3 align-top text-right tabular-nums">
-                          {(() => {
-                            const c = computeLine(line)
-                            return (
-                              <div className="flex h-11 flex-col justify-center">
-                                <span>{c.lineTotal.toFixed(2)}</span>
-                                <span className="text-xs text-muted-foreground">
-                                  net {c.receivedValue.toFixed(2)} + VAT {c.vatAmount.toFixed(2)}
-                                </span>
+                <Table className="text-base">
+                  <TableHeader>
+                    <TableRow>
+                      <TableHead className="h-12 w-56 px-3 text-sm">Item</TableHead>
+                      <TableHead className="h-12 w-24 px-3 text-sm">UOM</TableHead>
+                      <TableHead className="h-12 w-28 px-3 text-sm">Bin</TableHead>
+                      <TableHead className="h-12 w-32 px-3 text-sm">Qty</TableHead>
+                      <TableHead className="h-12 w-28 px-3 text-sm">Unit cost</TableHead>
+                      <TableHead className="h-12 w-24 px-3 text-sm">Disc %</TableHead>
+                      <TableHead className="h-12 w-24 px-3 text-sm">VAT %</TableHead>
+                      <TableHead className="h-12 w-28 px-3 text-sm text-right">Line total</TableHead>
+                      <TableHead className="h-12 w-56 px-3 text-sm">Hold status</TableHead>
+                      <TableHead className="h-12 w-44 px-3 text-sm">Batch / Serial</TableHead>
+                      <TableHead className="h-12 w-10 px-3" />
+                    </TableRow>
+                  </TableHeader>
+                  <TableBody>
+                    {lines.map((line) => {
+                      const item = itemFor(line.itemId)
+                      const errors = lineErrors[line.key] ?? {}
+                      return (
+                        <TableRow key={line.key}>
+                          <TableCell className="px-3 py-3 align-top">
+                            {line.poLineId ? (
+                              <div className="flex h-11 items-center text-base">
+                                {item ? `${item.sku} — ${item.name}` : `Item #${line.itemId}`}
                               </div>
-                            )
-                          })()}
-                        </TableCell>
-                        <TableCell className="px-3 py-3 align-top">
-                          <Select<HoldStatus>
-                            value={line.holdStatus}
-                            onValueChange={(v) => v && updateLine(line.key, { holdStatus: v })}
-                          >
-                            <SelectTrigger className="h-11! w-full text-base">
-                              <SelectValue />
-                            </SelectTrigger>
-                            <SelectContent>
-                              <SelectItem value="Available" className="text-base">Available</SelectItem>
-                              <SelectItem value="OnHold" className="text-base">On hold (inspection)</SelectItem>
-                            </SelectContent>
-                          </Select>
-                        </TableCell>
-                        <TableCell className="px-3 py-3 align-top">
-                          {item?.trackingMode === "Batch" && (
-                            <div className="flex flex-col gap-1.5">
-                              <Input
-                                placeholder="Batch no."
-                                value={line.batchNo}
-                                aria-invalid={!!errors.batchNo}
-                                onChange={(e) => updateLine(line.key, { batchNo: e.target.value })}
-                                className="h-9 text-sm"
-                              />
-                              <Input
-                                type="date"
-                                value={line.expiryDate}
-                                onChange={(e) => updateLine(line.key, { expiryDate: e.target.value })}
-                                className="h-9 text-sm"
-                              />
-                              <FieldError errors={[errors.batchNo ? { message: errors.batchNo } : undefined]} />
-                            </div>
-                          )}
-                          {item?.trackingMode === "Serial" && (
-                            <div className="flex flex-col gap-1.5">
-                              <textarea
-                                placeholder="One serial per line"
-                                value={line.serialNumbersText}
-                                aria-invalid={!!errors.serialNumbers}
-                                onChange={(e) => updateLine(line.key, { serialNumbersText: e.target.value })}
-                                className="min-h-16 w-full rounded-lg border border-input bg-transparent p-2 text-sm outline-none focus-visible:border-ring focus-visible:ring-3 focus-visible:ring-ring/50"
-                              />
-                              <FieldError errors={[errors.serialNumbers ? { message: errors.serialNumbers } : undefined]} />
-                            </div>
-                          )}
-                          {(!item || item.trackingMode === "None") && (
-                            <span className="text-sm text-muted-foreground">—</span>
-                          )}
-                        </TableCell>
-                        <TableCell className="px-3 py-3 align-top">
-                          <Button type="button" variant="ghost" size="icon" onClick={() => removeLine(line.key)} aria-label="Remove line">
-                            <Trash2 className="size-5" />
-                          </Button>
-                        </TableCell>
-                      </TableRow>
-                    )
-                  })}
-                </TableBody>
-              </Table>
+                            ) : (
+                              <>
+                                <Select<number | null> value={line.itemId} onValueChange={(v) => updateLine(line.key, { itemId: v })}>
+                                  <SelectTrigger className="h-11! w-full text-base" aria-invalid={!!errors.itemId}>
+                                    <SelectValue placeholder="Select item" />
+                                  </SelectTrigger>
+                                  <SelectContent className="w-md max-w-[80vw]" align="start">
+                                    {(items ?? []).map((i) => (
+                                      <SelectItem key={i.itemId} value={i.itemId} className="text-base">
+                                        {i.sku} — {i.name}
+                                      </SelectItem>
+                                    ))}
+                                  </SelectContent>
+                                </Select>
+                                <FieldError errors={[errors.itemId ? { message: errors.itemId } : undefined]} />
+                              </>
+                            )}
+                          </TableCell>
+                          <TableCell className="px-3 py-3 align-top">
+                            {line.poLineId ? (
+                              <div className="flex h-11 items-center text-base">
+                                {uoms?.find((u) => u.uomId === line.uomId)?.name ?? `#${line.uomId}`}
+                              </div>
+                            ) : (
+                              <>
+                                <Select<number | null> value={line.uomId} onValueChange={(v) => updateLine(line.key, { uomId: v })}>
+                                  <SelectTrigger className="h-11! w-full text-base" aria-invalid={!!errors.uomId}>
+                                    <SelectValue placeholder="UOM" />
+                                  </SelectTrigger>
+                                  <SelectContent>
+                                    {(uoms ?? []).map((u) => (
+                                      <SelectItem key={u.uomId} value={u.uomId} className="text-base">
+                                        {u.name}
+                                      </SelectItem>
+                                    ))}
+                                  </SelectContent>
+                                </Select>
+                                <FieldError errors={[errors.uomId ? { message: errors.uomId } : undefined]} />
+                              </>
+                            )}
+                          </TableCell>
+                          <TableCell className="px-3 py-3 align-top">
+                            <Select<number | null> value={line.binId} onValueChange={(v) => updateLine(line.key, { binId: v })}>
+                              <SelectTrigger className="h-11! w-full text-base">
+                                <SelectValue placeholder="None" />
+                              </SelectTrigger>
+                              <SelectContent>
+                                {bins.map((b) => (
+                                  <SelectItem key={b.binId} value={b.binId} className="text-base">
+                                    {b.code}
+                                  </SelectItem>
+                                ))}
+                              </SelectContent>
+                            </Select>
+                          </TableCell>
+                          <TableCell className="px-3 py-3 align-top">
+                            <Input
+                              type="number"
+                              min="0"
+                              step="any"
+                              value={line.qty}
+                              aria-invalid={!!errors.qty}
+                              onChange={(e) => updateLine(line.key, { qty: e.target.value })}
+                              className="h-11 text-base"
+                            />
+                            <FieldError errors={[errors.qty ? { message: errors.qty } : undefined]} />
+                          </TableCell>
+                          <TableCell className="px-3 py-3 align-top">
+                            <Input
+                              type="number"
+                              min="0"
+                              step="any"
+                              value={line.unitCost}
+                              aria-invalid={!!errors.unitCost}
+                              onChange={(e) => updateLine(line.key, { unitCost: e.target.value })}
+                              className="h-11 text-base"
+                            />
+                            <FieldError errors={[errors.unitCost ? { message: errors.unitCost } : undefined]} />
+                            {line.poUnitPrice !== null && Number(line.unitCost) !== line.poUnitPrice && (
+                              <p className="mt-1 text-xs text-warning">
+                                PO price {line.poUnitPrice.toFixed(2)} — variance recorded
+                              </p>
+                            )}
+                          </TableCell>
+                          <TableCell className="px-3 py-3 align-top">
+                            <Input
+                              type="number"
+                              min="0"
+                              max="100"
+                              step="any"
+                              value={(Number(totalDiscount) || 0) > 0 ? totalDiscount : line.discountPct}
+                              aria-invalid={!!errors.discountPct}
+                              onChange={(e) => updateLine(line.key, { discountPct: e.target.value })}
+                              className="h-11 text-base"
+                              disabled={(Number(totalDiscount) || 0) > 0}
+                            />
+                            <FieldError errors={[errors.discountPct ? { message: errors.discountPct } : undefined]} />
+                          </TableCell>
+                          <TableCell className="px-3 py-3 align-top">
+                            <Input
+                              type="number"
+                              min="0"
+                              max="100"
+                              step="any"
+                              value={line.vatPct}
+                              aria-invalid={!!errors.vatPct}
+                              onChange={(e) => updateLine(line.key, { vatPct: e.target.value })}
+                              className="h-11 text-base"
+                            />
+                            <FieldError errors={[errors.vatPct ? { message: errors.vatPct } : undefined]} />
+                          </TableCell>
+                          <TableCell className="px-3 py-3 align-top text-right tabular-nums">
+                            {(() => {
+                              const c = computeLine(line)
+                              return (
+                                <div className="flex h-11 flex-col justify-center">
+                                  <span>{c.lineTotal.toFixed(2)}</span>
+                                  <span className="text-xs text-muted-foreground">
+                                    net {c.receivedValue.toFixed(2)} + VAT {c.vatAmount.toFixed(2)}
+                                  </span>
+                                </div>
+                              )
+                            })()}
+                          </TableCell>
+                          <TableCell className="px-3 py-3 align-top">
+                            <Select<HoldStatus>
+                              value={line.holdStatus}
+                              onValueChange={(v) => v && updateLine(line.key, { holdStatus: v })}
+                            >
+                              <SelectTrigger className="h-11! w-full text-base">
+                                <SelectValue />
+                              </SelectTrigger>
+                              <SelectContent>
+                                <SelectItem value="Available" className="text-base">Available</SelectItem>
+                                <SelectItem value="OnHold" className="text-base">On hold (inspection)</SelectItem>
+                              </SelectContent>
+                            </Select>
+                          </TableCell>
+                          <TableCell className="px-3 py-3 align-top">
+                            {item?.trackingMode === "Batch" && (
+                              <div className="flex flex-col gap-1.5">
+                                <Input
+                                  placeholder="Batch no."
+                                  value={line.batchNo}
+                                  aria-invalid={!!errors.batchNo}
+                                  onChange={(e) => updateLine(line.key, { batchNo: e.target.value })}
+                                  className="h-9 text-sm"
+                                />
+                                <Input
+                                  type="date"
+                                  value={line.expiryDate}
+                                  onChange={(e) => updateLine(line.key, { expiryDate: e.target.value })}
+                                  className="h-9 text-sm"
+                                />
+                                <FieldError errors={[errors.batchNo ? { message: errors.batchNo } : undefined]} />
+                              </div>
+                            )}
+                            {item?.trackingMode === "Serial" && (
+                              <div className="flex flex-col gap-1.5">
+                                <textarea
+                                  placeholder="One serial per line"
+                                  value={line.serialNumbersText}
+                                  aria-invalid={!!errors.serialNumbers}
+                                  onChange={(e) => updateLine(line.key, { serialNumbersText: e.target.value })}
+                                  className="min-h-16 w-full rounded-lg border border-input bg-transparent p-2 text-sm outline-none focus-visible:border-ring focus-visible:ring-3 focus-visible:ring-ring/50"
+                                />
+                                <FieldError errors={[errors.serialNumbers ? { message: errors.serialNumbers } : undefined]} />
+                              </div>
+                            )}
+                            {(!item || item.trackingMode === "None") && (
+                              <span className="text-sm text-muted-foreground">—</span>
+                            )}
+                          </TableCell>
+                          <TableCell className="px-3 py-3 align-top">
+                            <Button type="button" variant="ghost" size="icon" onClick={() => removeLine(line.key)} aria-label="Remove line">
+                              <Trash2 className="size-5" />
+                            </Button>
+                          </TableCell>
+                        </TableRow>
+                      )
+                    })}
+                  </TableBody>
+                </Table>
               </div>
             )}
 
             {!poLoading && lines.length > 0 && (
-              <div className="flex justify-end gap-6 pr-12 text-base">
-                <span className="text-muted-foreground">Document total (incl. VAT)</span>
-                <span className="font-semibold tabular-nums">
-                  {lines.reduce((sum, l) => sum + computeLine(l).lineTotal, 0).toFixed(2)}
-                </span>
-              </div>
+                <div className="flex flex-col gap-3 border-t border-border pt-4 text-base">
+                  <div className="flex items-center gap-3 justify-end">
+                    <label className="text-sm text-muted-foreground">Total discount %</label>
+                    <Input
+                      type="number"
+                      min="0"
+                      max="100"
+                      step="any"
+                      value={totalDiscount}
+                      onChange={(e) => updateTotalDiscount(e.target.value)}
+                      className="w-28 text-sm"
+                    />
+                  </div>
+
+                  <div className="flex items-center gap-3 justify-end">
+                    <span className="text-muted-foreground">Document total (incl. VAT)</span>
+                    <span className="font-semibold tabular-nums">
+                      {(() => {
+                        const totalReceived = lines.reduce((s, l) => s + computeLine(l).receivedValue, 0)
+                        const totalVat = lines.reduce((s, l) => s + computeLine(l).vatAmount, 0)
+                        const pct = Number(totalDiscount) || 0
+                        if (pct > 0) {
+                          const discountedBase = totalReceived * (1 - pct / 100)
+                          const discountedVat = lines.reduce((s, l) => s + computeLine(l).vatAmount * (1 - pct / 100), 0)
+                          return (discountedBase + discountedVat).toFixed(2)
+                        }
+                        return (totalReceived + totalVat).toFixed(2)
+                      })()}
+                    </span>
+                  </div>
+                </div>
             )}
           </div>
 
@@ -671,7 +754,7 @@ export default function NewGrnPage() {
               Cancel
             </Link>
             <Button size="lg" type="button" onClick={handleSubmit} disabled={submitting}>
-              {submitting ? "Creating…" : "Create GRN"}
+              {submitting ? (editingGrnId ? "Saving…" : "Creating…") : editingGrnId ? "Save Changes" : "Create GRN"}
             </Button>
           </div>
         </>

Frontend/erp-system/app/dashboard/stock/page.tsx

@@ -1,69 +1,3 @@
-import Link from "next/link"
-import {
-  AlertOctagon,
-  AlertTriangle,
-  ArrowLeftRight,
-  BadgeDollarSign,
-  ClipboardList,
-  PackageSearch,
-  ScrollText,
-  SlidersHorizontal,
-  type LucideIcon,
-} from "lucide-react"
-
-import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card"
-
-const areas: { title: string; description: string; href: string; icon: LucideIcon }[] = [
-  {
-    title: "Stock Enquiry",
-    description: "On-hand, available, on-hold, and in-transit quantities by item and warehouse.",
-    href: "/dashboard/stock/enquiry",
-    icon: PackageSearch,
-  },
-  {
-    title: "Stock Ledger",
-    description: "The immutable, append-only movement journal — every in/out with running balance.",
-    href: "/dashboard/stock/ledger",
-    icon: ScrollText,
-  },
-  {
-    title: "Valuation",
-    description: "FIFO cost-layer breakdown and total stock value by item and warehouse.",
-    href: "/dashboard/stock/valuation",
-    icon: BadgeDollarSign,
-  },
-  {
-    title: "Transfers",
-    description: "Move stock between warehouses: create, dispatch, and receive (in-transit).",
-    href: "/dashboard/stock/transfers",
-    icon: ArrowLeftRight,
-  },
-  {
-    title: "Adjustments",
-    description: "Increase, decrease, or write off stock with a mandatory reason code.",
-    href: "/dashboard/stock/adjustments",
-    icon: SlidersHorizontal,
-  },
-  {
-    title: "Counts",
-    description: "Cycle or full physical counts — snapshot, enter counts, post variance.",
-    href: "/dashboard/stock/counts",
-    icon: ClipboardList,
-  },
-  {
-    title: "Reorder Alerts",
-    description: "Items at or below their reorder point, with a one-click requisition.",
-    href: "/dashboard/stock/reorder-alerts",
-    icon: AlertTriangle,
-  },
-  {
-    title: "Wastage",
-    description: "Damage, theft/loss, and expiry write-offs — reason-coded adjustments with a totals report.",
-    href: "/dashboard/stock/wastage",
-    icon: AlertOctagon,
-  },
-]
-
 export default function StockHubPage() {
   return (
     <div className="flex flex-col gap-6">
@@ -73,26 +7,6 @@ export default function StockHubPage() {
           FIFO-costed stock across multiple warehouses (FR-STK-01..14).
         </p>
       </div>
-
-      <div className="grid grid-cols-1 gap-4 sm:grid-cols-2 xl:grid-cols-3">
-        {areas.map((area) => (
-          <Link key={area.href} href={area.href}>
-            <Card className="h-full transition-shadow hover:shadow-md">
-              <CardHeader>
-                <div className="flex items-center gap-3">
-                  <div className="flex size-11 shrink-0 items-center justify-center rounded-xl bg-primary/10 text-primary">
-                    <area.icon className="size-5" />
-                  </div>
-                  <CardTitle className="text-lg">{area.title}</CardTitle>
-                </div>
-              </CardHeader>
-              <CardContent>
-                <p className="text-base text-muted-foreground">{area.description}</p>
-              </CardContent>
-            </Card>
-          </Link>
-        ))}
-      </div>
     </div>
   )
 }

Frontend/erp-system/app/globals.css

@@ -129,47 +129,45 @@
   --sidebar-ring: oklch(0.68 0.186 265.215);
 }
 
-/* Vibrant — the "System" toggle option. Light content area (background,
-   cards, header, table panels) paired with a dark sidebar — the same split
-   Linear/Vercel/Notion use in their light themes. One violet accent drives
-   every interactive state; the sidebar keeps its own dark token family
-   (applied via .sidebar-surface below) so it stays dark regardless. */
+/* Vibrant — the "System" toggle option. Light gray background and sidebar
+   throughout (no light content split), with one violet accent driving every
+   interactive state. */
 .vibrant {
-  --background: oklch(0.97 0.004 265);
-  --foreground: oklch(0.2 0.02 265);
-  --card: oklch(0.995 0.002 265);
-  --card-foreground: oklch(0.2 0.02 265);
-  --popover: oklch(0.995 0.002 265);
-  --popover-foreground: oklch(0.2 0.02 265);
-  --primary: oklch(0.55 0.2 275);
+  --background: oklch(0.82 0 0);
+  --foreground: oklch(0.2 0 0);
+  --card: oklch(0.99 0 0);
+  --card-foreground: oklch(0.2 0 0);
+  --popover: oklch(0.99 0 0);
+  --popover-foreground: oklch(0.2 0 0);
+  --primary: oklch(0.5 0.2 275);
   --primary-foreground: oklch(0.98 0 0);
-  --secondary: oklch(0.93 0.02 275);
-  --secondary-foreground: oklch(0.32 0.15 275);
-  --muted: oklch(0.94 0.006 265);
-  --muted-foreground: oklch(0.48 0.02 265);
-  --accent: oklch(0.55 0.14 210);
+  --secondary: oklch(0.82 0.02 275);
+  --secondary-foreground: oklch(0.35 0.15 275);
+  --muted: oklch(0.85 0 0);
+  --muted-foreground: oklch(0.45 0 0);
+  --accent: oklch(0.55 0.13 210);
   --accent-foreground: oklch(0.98 0 0);
-  --destructive: oklch(0.58 0.22 25);
-  --border: oklch(0.88 0.012 265);
-  --input: oklch(0.92 0.01 265);
-  --ring: oklch(0.55 0.2 275);
-  --success: oklch(0.55 0.15 150);
-  --warning: oklch(0.72 0.15 80);
-  --error: oklch(0.58 0.22 25);
-  --info: oklch(0.55 0.14 210);
-  --chart-1: oklch(0.55 0.2 275);
-  --chart-2: oklch(0.55 0.14 210);
-  --chart-3: oklch(0.55 0.15 150);
-  --chart-4: oklch(0.72 0.15 80);
-  --chart-5: oklch(0.58 0.22 25);
-  --sidebar: oklch(0.18 0.02 265);
-  --sidebar-foreground: oklch(0.96 0.005 265);
-  --sidebar-primary: oklch(0.64 0.19 275);
+  --destructive: oklch(0.55 0.22 25);
+  --border: oklch(0.78 0 0);
+  --input: oklch(0.8 0 0);
+  --ring: oklch(0.5 0.2 275);
+  --success: oklch(0.5 0.15 142.495);
+  --warning: oklch(0.65 0.15 72.031);
+  --error: oklch(0.55 0.22 25);
+  --info: oklch(0.55 0.13 210);
+  --chart-1: oklch(0.5 0.2 275);
+  --chart-2: oklch(0.55 0.13 210);
+  --chart-3: oklch(0.5 0.15 142.495);
+  --chart-4: oklch(0.65 0.15 72.031);
+  --chart-5: oklch(0.55 0.22 25);
+  --sidebar: oklch(0.82 0 0);
+  --sidebar-foreground: oklch(0.2 0 0);
+  --sidebar-primary: oklch(0.5 0.19 275);
   --sidebar-primary-foreground: oklch(0.98 0 0);
-  --sidebar-accent: oklch(0.28 0.03 265);
-  --sidebar-accent-foreground: oklch(0.96 0.005 265);
-  --sidebar-border: oklch(0.26 0.025 265);
-  --sidebar-ring: oklch(0.64 0.19 275);
+  --sidebar-accent: oklch(0.75 0 0);
+  --sidebar-accent-foreground: oklch(0.2 0 0);
+  --sidebar-border: oklch(0.7 0 0);
+  --sidebar-ring: oklch(0.5 0.19 275);
 }
 
 /* Re-points the shared tokens (--card, --foreground, --muted*, --primary...)
@@ -186,7 +184,7 @@
   --popover-foreground: var(--sidebar-foreground);
   --foreground: var(--sidebar-foreground);
   --muted: var(--sidebar-accent);
-  --muted-foreground: oklch(0.72 0.015 265);
+  --muted-foreground: oklch(0.4 0.015 265);
   --primary: var(--sidebar-primary);
   --primary-foreground: var(--sidebar-primary-foreground);
   --border: var(--sidebar-border);

Frontend/erp-system/components/Layouts/AppSidebar.tsx

@@ -4,6 +4,9 @@ import { useEffect, useState } from "react"
 import Link from "next/link"
 import { usePathname } from "next/navigation"
 import {
+  AlertOctagon,
+  AlertTriangle,
+  ArrowLeftRight,
   Banknote,
   BadgeDollarSign,
   BookOpen,
@@ -29,6 +32,7 @@ import {
   Menu,
   Package,
   PackageCheck,
+  PackageSearch,
   PackageX,
   PlayCircle,
   PieChart,
@@ -36,6 +40,7 @@ import {
   ReceiptText,
   Ruler,
   Scale,
+  ScrollText,
   Settings,
   ShieldCheck,
   ShoppingCart,
@@ -115,8 +120,27 @@ const navItems: {
       // { title: "Reports", code: "sales.reports", href: "/dashboard/sales/reports", icon: FileBarChart },
     ],
   },
-  { title: "Receiving", code: "receiving", href: "/dashboard/receiving/grn", icon: PackageCheck, chevron: true },
-  { title: "Stock", code: "stock", href: "/dashboard/stock", icon: Warehouse, chevron: true },
+  { title: "GRN", code: "receiving", href: "/dashboard/receiving/grn", icon: PackageCheck, chevron: true },
+  {
+    title: "Stock",
+    code: "stock",
+    href: "/dashboard/stock",
+    // Clicking "Stock" itself lands on Stock Ledger — the hub page underneath has nothing on
+    // it (its card grid was removed once the sidebar grew these sub-items), same as Procurement.
+    landingHref: "/dashboard/stock/ledger",
+    icon: Warehouse,
+    chevron: true,
+    children: [
+      { title: "Stock Ledger", code: "stock.ledger", href: "/dashboard/stock/ledger", icon: ScrollText },
+      { title: "Stock Enquiry", code: "stock.enquiry", href: "/dashboard/stock/enquiry", icon: PackageSearch },
+      { title: "Valuation", code: "stock.valuation", href: "/dashboard/stock/valuation", icon: BadgeDollarSign },
+      { title: "Transfers", code: "stock.transfers", href: "/dashboard/stock/transfers", icon: ArrowLeftRight },
+      { title: "Adjustments", code: "stock.adjustments", href: "/dashboard/stock/adjustments", icon: SlidersHorizontal },
+      { title: "Counts", code: "stock.counts", href: "/dashboard/stock/counts", icon: ClipboardList },
+      { title: "Reorder Alerts", code: "stock.reorder-alerts", href: "/dashboard/stock/reorder-alerts", icon: AlertTriangle },
+      { title: "Wastage", code: "stock.wastage", href: "/dashboard/stock/wastage", icon: AlertOctagon },
+    ],
+  },
   { title: "Warehouses", code: "warehouses", href: "/dashboard/warehouse", icon: Building2, chevron: true },
   { title: "Orders", code: "orders", href: "/dashboard/orders", icon: ShoppingCart, chevron: true },
   {
@@ -402,14 +426,15 @@ export function AppSidebar() {
   // flashing the full menu to a restricted role. Once resolved, a nav item
   // is visible if its own code is granted, or (for parents) if any child is.
   //
-  // "procurement", "hrm", "sales" and "production" are exempted from that check (frontend-only): no
-  // role is currently seeded with NAV:procurement/NAV:hrm/NAV:production or their children
-  // server-side, which would hide the whole section for everyone. Remove each bypass once roles are granted
-  // the permission properly (Settings → Roles → Sidebar permissions) or a backend seed
-  // grants it. This is also flagged in 02-SECURITY.md as the AR-09 sidebar-visibility
+  // "procurement", "hrm", "sales", "production" and "stock" are exempted from that check
+  // (frontend-only): no role is currently seeded with NAV:procurement/NAV:hrm/NAV:production
+  // or their children server-side (stock's children specifically have no SubNavItem rows at
+  // all yet), which would hide the whole section for everyone. Remove each bypass once roles
+  // are granted the permission properly (Settings → Roles → Sidebar permissions) or a backend
+  // seed grants it. This is also flagged in 02-SECURITY.md as the AR-09 sidebar-visibility
   // stopgap for HRM's salary/PII data — it hides HRM from the UI but doesn't enforce
   // anything server-side.
-  const bypassCodes = new Set(["procurement", "sales", "hrm", "production"])
+  const bypassCodes = new Set(["procurement", "sales", "hrm", "production", "stock"])
   const visibleItems = loading
     ? []
     : navItems

Frontend/erp-system/components/ui/select.tsx

@@ -4,7 +4,7 @@ import * as React from "react"
 import { Select as SelectPrimitive } from "@base-ui/react/select"
 
 import { cn } from "@/lib/utils"
-import { ChevronDownIcon, CheckIcon, ChevronUpIcon } from "lucide-react"
+import { ChevronDownIcon, CheckIcon, ChevronUpIcon, SearchIcon } from "lucide-react"
 
 // Base UI's `Select.Value` renders the raw selected value (e.g. an id) unless the Root is
 // given an `items` map to resolve the label from — the popup items are unmounted when closed,
@@ -61,6 +61,50 @@ function SelectValue({ className, ...props }: SelectPrimitive.Value.Props) {
   )
 }
 
+/** Flattens a node's rendered text so a SelectItem can be matched against a search query. */
+function nodeToText(node: React.ReactNode): string {
+  if (node === null || node === undefined || typeof node === "boolean") return ""
+  if (typeof node === "string" || typeof node === "number") return String(node)
+  if (Array.isArray(node)) return node.map(nodeToText).join(" ")
+  if (React.isValidElement(node)) {
+    return nodeToText((node.props as { children?: React.ReactNode }).children)
+  }
+  return ""
+}
+
+/** Walks the popup's children, dropping any SelectItem whose text doesn't match the query. */
+function filterSelectChildren(children: React.ReactNode, query: string): React.ReactNode {
+  const q = query.trim().toLowerCase()
+  if (!q) return children
+
+  return React.Children.map(children, (child) => {
+    if (!React.isValidElement(child)) return child
+    if (child.type === SelectItem) {
+      const text = nodeToText((child.props as { children?: React.ReactNode }).children).toLowerCase()
+      return text.includes(q) ? child : null
+    }
+    const nested = (child.props as { children?: React.ReactNode }).children
+    if (nested !== undefined) {
+      return React.cloneElement(child, undefined, filterSelectChildren(nested, query))
+    }
+    return child
+  })
+}
+
+function countSelectItems(node: React.ReactNode): number {
+  let count = 0
+  React.Children.forEach(node, (child) => {
+    if (!React.isValidElement(child)) return
+    if (child.type === SelectItem) {
+      count += 1
+      return
+    }
+    const nested = (child.props as { children?: React.ReactNode }).children
+    if (nested !== undefined) count += countSelectItems(nested)
+  })
+  return count
+}
+
 function SelectTrigger({
   className,
   size = "default",
@@ -96,13 +140,27 @@ function SelectContent({
   sideOffset = 4,
   align = "center",
   alignOffset = 0,
-  alignItemWithTrigger = true,
+  // Aligning the popup to the selected item lets it float above the trigger (and above the
+  // search box). A plain dropdown that always opens fully below the trigger is what the
+  // search box needs to stay pinned to the top, so this defaults to off now.
+  alignItemWithTrigger = false,
   ...props
 }: SelectPrimitive.Popup.Props &
   Pick<
     SelectPrimitive.Positioner.Props,
     "align" | "alignOffset" | "side" | "sideOffset" | "alignItemWithTrigger"
   >) {
+  const [query, setQuery] = React.useState("")
+  const searchRef = React.useRef<HTMLInputElement>(null)
+
+  // The popup remounts each time it opens, so this only ever fires once per open.
+  React.useEffect(() => {
+    searchRef.current?.focus()
+  }, [])
+
+  const filteredChildren = React.useMemo(() => filterSelectChildren(children, query), [children, query])
+  const noResults = query.trim().length > 0 && countSelectItems(filteredChildren) === 0
+
   return (
     <SelectPrimitive.Portal>
       <SelectPrimitive.Positioner
@@ -119,8 +177,27 @@ function SelectContent({
           className={cn("relative isolate z-50 max-h-(--available-height) w-(--anchor-width) min-w-36 origin-(--transform-origin) overflow-x-hidden overflow-y-auto rounded-lg bg-popover text-popover-foreground shadow-md ring-1 ring-foreground/10 duration-100 data-[align-trigger=true]:animate-none data-[side=bottom]:slide-in-from-top-2 data-[side=inline-end]:slide-in-from-left-2 data-[side=inline-start]:slide-in-from-right-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2 data-open:animate-in data-open:fade-in-0 data-open:zoom-in-95 data-closed:animate-out data-closed:fade-out-0 data-closed:zoom-out-95", className )}
           {...props}
         >
+          <div data-slot="select-search" className="sticky top-0 z-10 bg-popover p-1.5 pb-1">
+            <div className="relative">
+              <SearchIcon className="pointer-events-none absolute top-1/2 left-2 size-3.5 -translate-y-1/2 text-muted-foreground" />
+              <input
+                ref={searchRef}
+                type="text"
+                value={query}
+                onChange={(e) => setQuery(e.target.value)}
+                onKeyDown={(e) => {
+                  if (e.key !== "Escape") e.stopPropagation()
+                }}
+                placeholder="Search…"
+                className="h-8 w-full rounded-md border border-input bg-transparent pr-2 pl-7 text-sm outline-none focus-visible:border-ring focus-visible:ring-3 focus-visible:ring-ring/50"
+              />
+            </div>
+          </div>
           <SelectScrollUpButton />
-          <SelectPrimitive.List>{children}</SelectPrimitive.List>
+          <SelectPrimitive.List>{filteredChildren}</SelectPrimitive.List>
+          {noResults && (
+            <div className="px-2 py-6 text-center text-sm text-muted-foreground">No results found.</div>
+          )}
           <SelectScrollDownButton />
         </SelectPrimitive.Popup>
       </SelectPrimitive.Positioner>

Frontend/erp-system/lib/api/grns.ts

@@ -43,6 +43,10 @@ export const grnsApi = {
     return apiRequest<Grn>("/grns", { method: "POST", body: request })
   },
 
+  update(grnId: number, request: CreateGrnRequest): Promise<Grn> {
+    return apiRequest<Grn>(`/grns/${grnId}`, { method: "PUT", body: request })
+  },
+
   /**
    * Posts the receipt. Pass a stable idempotencyKey per detail-page session so a retry
    * cannot double-post stock — unlike the old mock, the server genuinely dedupes on it.

Frontend/erp-system/types/grn.ts

@@ -49,6 +49,8 @@ export interface CreateGrnRequest {
   vendorId?: number | null
   warehouseId: number
   lines: CreateGrnLineInput[]
+  /** Optional total document-level discount % (0–100). When set, per-line discounts are cleared. */
+  totalDiscount?: number
 }
 
 export interface GrnLine {