diff --git a/app/Modules/SberPaymentOrder/Nova/Resources/NovaSberPaymentOrder.php b/app/Modules/SberPaymentOrder/Nova/Resources/NovaSberPaymentOrder.php
index 232cad5..9dd7285 100644
--- a/app/Modules/SberPaymentOrder/Nova/Resources/NovaSberPaymentOrder.php
+++ b/app/Modules/SberPaymentOrder/Nova/Resources/NovaSberPaymentOrder.php
@@ -278,7 +278,7 @@ class NovaSberPaymentOrder extends Resource
                     name: __('Goýum hasaby'),
                     attribute: 'sender_deposit_account'
                 )->fullWidth()
-                    ->rules('required', 'string', 'max:255')
+                    ->rules('required', 'digits:15')
                     ->fillUsing(function ($request, $model, $attribute) {
                         $model->sender_deposit_account = strval($request->sender_deposit_account);
                     }),