VF06 - FI Document without TCODE in BKPF table

Hi,

I'm trying to use the VF06 to implement an automatic billing process, but when I started the job, the system create all billing documents normally, but when I check the associated FI documents, the TCODE field is blank in BKPF table.

I have 2 problem here:

1 - For SOX audit compliance I must have all FI documents with TCODE filled (for example VF01, VF02, etc..)

2 - I have some validation/sustituion rules, that track billing process by transaction.

Can anyone, could you help me in a possible solution?

Tks.

Leonardo