This draft standard for trial use contains the format and establishes the data contents of the motor carrier bill of lading transaction set (211) for use within the context of an electronic data interchange (edi) environment. A bill of lading (bol) is a legal agreement serving as a contract between the shipper and the carrier. View, print, email or request a fax for bills of lading, weight and inspection certificates, and delivery receipts. Pro numbers are 9 or 10 (with a check digit) numbers. A blank bill of lading or “bol” is an official document issued by a carrier to you (as the shipper) as a contract of carriage of goods.