Reverse with field in FBL1n or FBL3n report

Hi,

Reversal document number not showing in Reverse With field instead its appearing under Clearing Document field in FBL1n & FBL3n reports. In BKPF table its showing under Reverse with field i.e. STBLG field. Pls advice how to update Reverse with field in FBL1n & FBL3n .

Regards,

Varsha