How to change a Credit Card Commission Currency

Hi Experts,

I hope you can help me with a question I have...

I have a USD Customer who is paying a USD AR Invoice by a Credit Card.

I am in Banking -> Deposits -> Credit Card. I have selected my Deposit Currency as USD, selected my Euro Bank Account (which is also defined as All Currencies), selected my deferred payments account (which is defined as all currencies). I have selected the row which is being paid.

Then I click on the Commissions ... button and I now want to enter the commission amount, but I need to do this in USD, and I can't figure out how to change the currency, it always shows as GBP.

Can anyone help me with this one please?

Many thanks,

Caroline