I am facing following constraint error when I refund (Supplier or Customer) Invoice that is in foreign currency.

"The amount expressed in the secondary currency must be positive when account is debited and negative when account is credited."

I faced this issue in v7 and odoo (v8).

Is it a bug or a configuration issue.

I found Bug, but there is no clue.

Kindly assist me asap.

Thanks in advance.