The currency is wrong for this transaction
To change the currency for this transaction, click the Currency button and make the change in the window that appears. You can also change the exchange rate for this transaction, if required. To change the exchange rate for all future transactions using this currency, also mark the "Update Current Exchange Rate in the Currency List" option. Then click OK.
The Currency button appears only if you've selected the Multicurrency option in the System view of the Preferences window.