To transmit identifying numbers and other basic data relating to the transaction set
Identifying number assigned by issuer
B1001 is the carrier's PRO (invoice number) that identifies the shipment.
Identification number assigned to the shipment by the shipper that uniquely identifies the shipment from origin to ultimate destination and is not subject to modification; (Does not contain blanks or special characters)
Standard Carrier Alpha Code
B1003 is required when used in Transaction Set 214.
Identifying number assigned by inquirer
Code Qualifying the Reference Identification
Reference information as defined for a particular Transaction Set or as specified by the Reference Identification Qualifier
B1006 is the carrier assigned bar code identification or another carrier assigned shipment identification, such as a manifest number.
