Trying to add validation to the editable column Amount,

Inside the controller added new operation, and I set my amount field as not null in DB So I am getting that error

use BackpackEditableColumnsHttpControllersOperationsMinorUpdateOperation;

Controller:

$this->crud->addColumn([
'label' => 'Amount',
'type'  => 'editable_text',
'name'  => 'amount']);


protected function setupMinorUpdateOperation(){
  $this->crud->setValidation(AmountRequest::class);
}

AmountRequest :

public function rules() {
return [
    'amount' => 'required',
    ];
}