MBL Bill of Lading
To specify a bill of lading number and the bill of lading issuer
Standard Carrier Alpha Code
Identification number assigned to the shipment by the carrier or consolidator
Code indicating type of action
Code indicating a Yes or No condition or response
If MBL04 is "Y", then issuer is an automated manifest system (AMS) participant. If "N", then issuer is not an AMS participant.