Add validation for item codes in updateGR method to ensure they are at least 6 digits and numeric

app/Http/Controllers/PdfController.php

@@ -134,6 +134,30 @@ class PdfController extends Controller
             ], 400);
         }
 
+        $invalidLengthItemCodes = [];
+
+        foreach ($data['item_codes'] as $item) {
+            $itemCode = $item['item_code'] ?? null;
+
+            // Skip if item code is missing
+            if (!$itemCode) {
+                continue;
+            }
+
+            // Check if item code is less than 6 digits or not numeric
+            if (strlen($itemCode) < 6 || !ctype_digit($itemCode)) {
+                $invalidLengthItemCodes[] = $itemCode;
+            }
+        }
+        if (count($invalidLengthItemCodes) > 0) {
+            return response()->json([
+                'status_code' => 'ERROR',
+                'status_description' => 'Some item codes are invalid: must be at least 6 digits!',
+                'invalid_item_codes' => array_values($invalidLengthItemCodes)
+            ], 400);
+        }
+
+
         $invalidItemCodes = [];
         $invalidPlantItems = [];