diff --git a/app/Filament/Resources/MotorTestingMasterResource.php b/app/Filament/Resources/MotorTestingMasterResource.php
index e320350fc..5088cf796 100644
--- a/app/Filament/Resources/MotorTestingMasterResource.php
+++ b/app/Filament/Resources/MotorTestingMasterResource.php
@@ -20,6 +20,7 @@ use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Database\Eloquent\SoftDeletingScope;
 use Filament\Tables\Actions\ImportAction;
 use Filament\Tables\Actions\ExportAction;
+use Illuminate\Validation\Rule;
 
 class MotorTestingMasterResource extends Resource
 {
@@ -62,6 +63,7 @@ class MotorTestingMasterResource extends Resource
                     ->hintColor('danger'),
                 Forms\Components\Select::make('item_id')
                     ->label('Item Code')
+                    //->relationship('item', 'name')
                     ->options(function (callable $get) {
                         $plantId = $get('plant_id');
                         if (!$plantId) {
@@ -74,7 +76,12 @@ class MotorTestingMasterResource extends Resource
                     })
                     ->required()
                     ->searchable()
-                    ->reactive(),
+                    ->reactive()
+                    ->rule(function (callable $get) {
+                        return Rule::unique('motor_testing_masters', 'item_id')
+                            ->where('plant_id', $get('plant_id'))
+                            ->ignore($get('id')); // Ignore current record during updates
+                    }),
                 Forms\Components\TimePicker::make('routine_test_time')
                     ->label('Routine Test Time')
                     ->default('00:40:00')