public SalesOrder VHasNoDeliveryOrder(SalesOrder salesOrder, IDeliveryOrderService _deliveryOrderService) { IList <DeliveryOrder> deliveryOrders = _deliveryOrderService.GetObjectsBySalesOrderId(salesOrder.Id); if (deliveryOrders.Any()) { salesOrder.Errors.Add("Generic", "Sudah memiliki delivery order"); } return(salesOrder); }