Your requirements are:
1.You need to create Proforma invoices for deliveries.
2.here if PGI--not done --then even proforma also not allowed to create.
Then:
1.In VTFL--make header copying requirements as 009.(JEX --LF COMBINATION)
2.at Item--keep 311 as copying requirement.
Note: this will work perfect for delivery related billing.
pl update..
Phanikumar