How to add a flag 'J' in the segment 711 pos 59 of the outbound VDA envelope?
The field #711J is populated from the Pre-Session extended rules which are executed when the Generic Envelope service calls the BldIvda map.
The BldIvda map can be found under Deployment > Maps.
The Pre-Session Extended rules are found under Edit > Session Rules when the BldIvda.map source file is opened in the Map Editor.
The default definition is :
$INPUT.#711J = "";
Modify the rule to check for your Trading Partner code and add the "J" value where required