Code identifying a segment.
Type
A
Length
Max 3 / Min 3
Codes
<> UNA
Service string advice
To define the characters selected for use as delimiters and indicators in the rest of the interchange that follows.
<> UNB
Interchange header
To start, identify and specify an interchange.
<> UNE
Functional group trailer
To end and check the completeness of a functional group.
<> UNG
Functional group header
To head, identify and specify a functional group.
<> UNH
Message header
To head, identify and specify a message.
<> UNS
Section control
To separate header, detail and summary sections of a message.
<> UNT
Message trailer
To end and check the completeness of a message.
<> UNZ
Interchange trailer
To end and check the completeness of an interchange.
