The issue is that you have no element in your purchase order that identifies it.

问题是，鉴别它的购买订单中没有元素。

youdao

Issue the purchase order and release to supplier and chase the delivery performance;

下采购订单，发送给供应商并且追踪发货情况；

youdao

Issue the purchase order and release to supplier and chase the delivery performance;

下采购订单，发送给供应商并且追踪发货情况；

youdao