Adding custom index to an Audit Table

Hello, our JDE is E920, Tools 9.2.5.3. We would like to add a custom index (AN8, CFRACTION) to Audit Table A0101 and use it in a report. But when we open the table in TDA, it says "The table ia an audit table and is currently enabled for auditing. Cannot continue". Does JDE support custom index in audit table and if yes, how do we do it? If no, any workaround? Thank you.

Regards,

Kwan Lam