正如移动类型502一样，可以不带参考采购订单地输入一个退货交货（单）给供应商，但发货时要通过交货单来过帐。
As with movement type 502, a return delivery to the vendor is entered without reference to the purchase order, but the goods issue is posted via a delivery in Shipping.
对于有采购订单的收货，在收到供应商退回的包装，及特殊库存标识为M供应商可退回包装，可以使用移动类型501。
For a goods receipt for purchase order 101, the receipt of returnable transport packaging can be entered using movement type 501 and special stock indicator m.
如果采购订单或订单没有指定科目，其库存类型(非限制使用库存、质量检验库存、冻结库存)可以在收货的时候输入。
If the purchase order or order has not been assigned to an account, a stock type unrestricted-use stock, stock in quality inspection, blocked stock can be entered during goods receipt.
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