diff --git a/app/Filament/Pages/PanelBoxInspectionStock.php b/app/Filament/Pages/PanelBoxInspectionStock.php
index eb9130f..9f87d84 100644
--- a/app/Filament/Pages/PanelBoxInspectionStock.php
+++ b/app/Filament/Pages/PanelBoxInspectionStock.php
@@ -310,6 +310,22 @@ class PanelBoxInspectionStock extends Page
             $itemCode = $panelBoxCode;
             $serialNumber = $panelBoxSerialNo;
 
+            if (strlen($serialNumber) > 28) {
+                Notification::make()
+                    ->title('Invalid Serial Number')
+                    ->body("Serial number cannot be greater than 28 characters. Current length: " . strlen($panelBoxSerialNo))
+                    ->danger()
+                    ->send();
+
+                $this->form->fill([
+                    'plant_id' => $plantId,
+                    'line_id'  => $lineId,
+                    'item_id'  => null,
+                ]);
+
+                return;
+            }
+
             $iId = Item::where('code', $itemCode)->where('plant_id', $plantId)->first();
 
             if(!$iId){