WHT tax code change from one rate to another rate

Summary:

How to change WHT tax code in existing Tax rate rule.

Content (required):

Business would like to change the WHT tax code from 3% to 2%. I don't want to create new DFS, Condition Set for this change.

Is there way to change the Tax code from 3% to 2% in Tax rate rule. Creating new DFS, Condition set is big task as i defined multiple Condition set.

I tried to end date existing rule and try to use same Condition set and try to assigned different WHT tax code but system is giving error: "You can't create more than one result for the same tax condition set within a tax rule. (ZX-885323)".