Added validation logic in process order importer

app/Filament/Imports/ProcessOrderImporter.php

@@ -74,6 +74,17 @@ class ProcessOrderImporter extends Importer
             $warnMsg[] = "User not found";
         }
 
+        if ($plant && $processOrder != '') {
+
+            $existingOrder = ProcessOrder::where('plant_id', $plant->id)
+                ->where('process_order', $processOrder)
+                ->first();
+
+            if ($existingOrder && $existingOrder->item_id !== ($itemCode->id ?? null)) {
+                $warnMsg[] = "Same Process Order already exists for this Plant with a different Item Code";
+            }
+        }
+
         if (!empty($warnMsg)) {
             throw new RowImportFailedException(implode(', ', $warnMsg));
         }