产品开发退换货-采购rpc

src/Service/Interfaces/PurchaseNew/PurchaseStockServiceInterface.php

@@ -100,7 +100,7 @@ interface PurchaseStockServiceInterface
         "num":"退换货数量",
         "logistics_no":"物流单号"
         }
-     * @return  true | error_msg
+     * @return  true | string (error_msg)
      */
     public function  returnOrExchangeProducts($post);