I created an extended IDOC for standard DELVRY03 and added a new child segment to E1EDL24 to pop up new fields. This IDOC will be created when VL01/2N its used.
My question is: What is the user-exit that I need to pop up new child segment?
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The function module for outbound processing is IDOC_OUTPUT_DELVRY. Within its coding you will find all the user-exits. In addition, check the package VTRK to which this function module (function group) is assigned.
There you will find the exit function groups: XTRK & XV56KBAPI