Accounting document not generated automatically

Hi,

When I create a billing document via VF01, no accounting document is generated:
Error message
Document 90080752 saved (no accounting document generated)
Message no. VF050
When I look at the Account Determination Analysis , the correct GL account is determined via KOFK.
I then release the document with VF02 and an accounting document gets generated.
I am aware of a cost centre substitution rule that exits. Could this cause a problem.
Thanks