FNCJ, Changes in Debeit/Credit indicator by susbtitution

Hi:

I need to make same changes in Cash of Journal, Tx. FBXJ. Fields Posting Key (BSCHL) and Debit/credit indicator (SHKZG). I try a substitution, but I can change only Posting Key but I can not find the way to change Debit/credit indicator in final FI documento. It is possible to change in sustitution, but change is not recorded in Fi document.

Do you know is there is an user (or badi…) exit to make this change?

Thanks in advance for your help.

Best regards.