Hi Rehman,
Many a thanks, I'm able to create Billing, I tried following combinations last night and all worked
OR-->FX
OR-->F2
ZOR(copied from OR)-->F2
After reading your response I tried
OR-->FX
and as long as copy control from SO to Billing is maintained it works.
I noticed that if we provide SO # in the REF_DOC then post billing is created and if we go to Document flow we see the Reference SO under that the Billing document and if we don't give the REF_DOC then its just a plain direct Billing. Which is as expected.
Thanks for your help. Much appreciate it.
Cheers!!!