I have worked today on proforma invoice.
The delivery is batch active and 2 lines are created from the same invoice.
However a technical requirement is that a signle line should populate in the invoice. This invoice should be transfered to another system running on oracle to have account posting (Account posting).
This is possible to have one line item in the invoice from 2 batch splitted item from the delivery document with some configuration and without ABAP help.
It should be remembered the batch splitted item should have a different item cat other than the main line item (same canfig is applicable whenn we have a HU active material).
I felt great solving this simar to solving harder mathematical problems.