属性
数据类型AN
必须?Optional
长度Min 1 / Max 22
Element
X12 EDI Release 00502
W06
474Master Reference (Link) Number
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)
