Dear,
What I am saying is If we created Sales Order ,Delivery and Billing and then FI team will be cleared in FI transaction .Now ,coming to the point is If you want recover that then reverse the whole process like when you cancel the Invoice in VF11 then it will be effected on same G/L account and do reversal PGI in VL09 .
or else create Debit Memo request and do Debit memo but assign same G/L accounts to this process also.
Thanks,
Naren