Marking negative postings indicator (XNEGP) afterwards

Hi,

I need to mark a single document as negative posting after being reversed. The reversal has already taken place and I dont want this document and its reversal have no affect in GL balances.

I have marked XNEGP for this document and its reversal document in BSIS and BSEG. But this has no effect on

account balance.

Is there a correction program that you know? Any workaround will be appreciated.

Best regards.

Tugrul Bil