diff --git a/src/modules/restaurants/providers/restaurant-shipment-method.service.ts b/src/modules/restaurants/providers/restaurant-shipment-method.service.ts
index 716171a..532693a 100644
--- a/src/modules/restaurants/providers/restaurant-shipment-method.service.ts
+++ b/src/modules/restaurants/providers/restaurant-shipment-method.service.ts
@@ -115,7 +115,8 @@ export class RestaurantShipmentMethodService {
       // Check if the new relationship already exists
       const existing = await this.restaurantShipmentMethodRepository.findOne({
         restaurant: { id: restId },
-        shipmentMethod: { id: { $ne: restaurantShipmentMethodId } },
+        shipmentMethod: { id: updateDto.shipmentMethodId },
+        id: { $ne: restaurantShipmentMethodId },
       });
 
       if (existing) {