diff --git a/app/Filament/Pages/PanelBoxInspectionStock.php b/app/Filament/Pages/PanelBoxInspectionStock.php
index c1543f34..16fa4747 100644
--- a/app/Filament/Pages/PanelBoxInspectionStock.php
+++ b/app/Filament/Pages/PanelBoxInspectionStock.php
@@ -17,6 +17,7 @@ use Filament\Forms\Components\Select;
 use Filament\Forms\Components\TextInput;
 use Filament\Facades\Filament;
 use Illuminate\Support\Facades\Auth;
+use App\Models\InvoiceValidation;
 
 class PanelBoxInspectionStock extends Page
 {
@@ -445,6 +446,23 @@ class PanelBoxInspectionStock extends Page
             }
         }
 
+        $panelExistsInvoice = InvoiceValidation::where('plant_id', $this->plantId)
+                ->where('panel_box_serial_number', $serialNumber)
+                // ->where('panel_box_code', $itemCode)
+                ->where('panel_box_supplier', $supplier)
+                ->first();
+
+        if ($panelExistsInvoice) {
+            Notification::make()
+                ->title('Duplicate Panel Box Serial Number')
+                ->body("Duplicate panel already exists.<br>Panel Box Code: $itemCode, Item Code: {$this->currentItemCode}, Serial Number: $serialNumber, Supplier Number: $supplier against invoice Number: $panelExistsInvoice->invoice_number")
+                ->danger()
+                ->seconds(2)
+                ->send();
+
+            return;
+        }
+
         $serialExists = PanelBoxValidation::where('plant_id', $plantId)->where('serial_number', $serialNumber)->where('panel_box_supplier', $supplier)->first();
 
         if ($serialExists) {