For info, I was also able to use Sub-table structure mapping, but only in /AIF/CUST/ and not in /AIF/IFB
Except that this needs mapping field by field, so the ABAP code is still better for me.
For info, I was also able to use Sub-table structure mapping, but only in /AIF/CUST/ and not in /AIF/IFB
Except that this needs mapping field by field, so the ABAP code is still better for me.