Invoice Issue Date.

Identifying number assigned by issuer.

Date assigned by the purchaser to Purchase Order.

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

Number assigned by a vendor referencing a particular customer purchase order.

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.)

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'.)

Code specifying the type of transaction.