Honor TAB rules for Charge Account Segments updated by users

Summary

Honor TAB rules for Charge Account Segments updated by users

Content

Gurus,

I have a requirement where the users will need update the Charge Account on Requisition line (Note currently there is an ER to make the Charge Account non-editable). Since I cannot make it non-editable, is there a way, through conditions in Account Rules in TAB, that I can let the users update the Charge Account but the TAB rules overwrite the Charge Account again essentially making them honor TAB rules

Any inputs are highly appreciated.

Thanks,

Manoj