Reference X12 Release 8020 Elements 474 Master Reference (Link) Number
474 Master Reference (Link) NumberReference 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) Type String (AN) Length Min 1 / Max 22
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