As the letter of credit provided the goods are generally shipped no later than the period (reflected in the documentation, that is, signing a bill of lading date), in operation, often near the delivery period before they are well organized supply, and sometimes it will cause the goods can not be timely departure. At this time, in order to be able to meet the letter of credit documentation requirements, the owner issued bond (sometimes also called the consignee of the bond, called double-bond), the signing date of the application to the premise of the bill of lading to the required date. This is the backdating of bills of lading.