ANSI X12 data

The basic business document in ANSI X12 data is called a transaction set. Transaction sets are enclosed in an envelope that separates one transaction set from another (ST-SE envelope).

Groups of transaction sets that are functionally related are enclosed in a functional group envelope (GS-GE envelope). The functional group envelope separates one functional group from another. Functional groups that come from the same trading partner are grouped in an interchange envelope (ISA-IEA envelope). A series of interchanges from a variety of trading partners forms a transmission.