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EDI Transaction Set-Message Structural Element

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The transaction set (in X12 encoding) or message (in EDIFACT encoding) contains segments that make up the message data. The transaction set consists of a header, a collection of data segments, and a trailer. All details that are required to process the transaction are available within the transaction set.

A transaction set must start with a ST Transaction Set Header (in X12) or a UNH Message Header (in EDIFACT). It must end with a SE Transaction Set Trailer (in X12) or a UNT Message Trailer (in EDIFACT). The trailer provides a count of the data segments that includes the header and trailer segments.

A transaction set can contain one or more loops, which are required to repeat a collection of related segments.