Code identifying purpose of transaction set.

Identifying number for warehouse shipping order assigned by the depositor.

Identifying number for Purchase Order assigned by the orderer/purchaser.

A two-part number in the form `SSSTTT' where `SSS' is a sequentially assigned number and `TTT' equals the highest sequential number being used within the associated (linked) group. (Leading zeros are required for both `SSS' and `TTT'.)

Reference number assigned by the sender to relate a transaction set to a master transaction. (When associating a group of purchase orders, invoices or other transaction sets, use the master reference (link) number to identify the group and the link sequence number to identify individual transaction sets within the group.)