Please note that written proof of delivery is not provided for registered mail.

挂号邮件不提供书面签收回条服务。

How often are there problems with proof of delivery documentation at the delivery point?

在发货点交货证明文件发生问题的频率？

The seller must provide the buyer at the seller's expense with the usual proof of delivery of the goods in accordance with A4.

卖方必须自担费用向买方提供证明按照A4规定交货的通常单据。

The buyer has to sign a delivery note as proof of receipt.

购买者必须签收送货单表明货已收到。

The Supplier may be required to furnish proof of having effected delivery.

供应商可能被要求提供已经实施交付行为的证明。