In my experience, the TA1 segment is most commonly used between VANs at the mailbag level enveloping to help separate the mailbag enveloping from the interchanges inside the mailbag.
 

Kelly Babcock
EDI/Messaging Architect
MedAssets.com
3755 Mansell Road
Suite 300
Alpharetta, GA 30022
Phone:  678-323-2542
Email:   [EMAIL PROTECTED]

 

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