Error FZ331 During payment run in F110?

Hi Experts,

While processing payment run F110 system is giving error message FZ331 "Account & for cash discount must not have a tax code".

But when i went to details through Job log, i found problem with one GL account which is relating to Small Differences.

i given solution to keep blank "Tax Category" in that difference GL account.

This Error is cam first time...previous all payment documents got posted successfully though same Difference GL account XXX assigned in system.

Regards,

Ravan