REFUND in secondary currency problem

Dear Sir/Madam,

I have a problem refunding in a secondary currency.
First i have created a refund journal. type: sale refund (no currency defined so my primary currency is default).
I have a confirmed sales order, a cancelled delivery from warehouse, an invoice that needs to be refunded.
In the invoice we choose refund invoice.
Create A draft refund. We type a reason and select the Refund Journal (currency)
Select Draft Refund and click Register Payment.
The paid amount is a negative in the primary currency.
For Payment method, the cash journal in the secondary currency is selected.
Payment amount changes to 0.00 and the currency symbol is changed to the secondary currency.
I enter a negative amount and hit the pay button.

After this i receive the following error:
ValidateError

Error occurred while validating the field(s) amount_currency: The amount expressed in the secondary currency must be positive when the journal item is a debit and negative when if it is a credit.

Please help and thank you in advance.

Jeff