A few months back, I created a supplier that charges me in US Dollars. I then created the exchange rate at the time in the Exchange Rate tab in Manager. I created an invoice and put in the US Dollar Amount. I then paid the invoice and as far as I can recall, in the payment section put in the US Dollar Amount from the invoice and it automatically filled the £ Sterling Amount with the exchange rate.
Its not doing this now. When I select payment its putting the Dollar Amount in the local currency field and there is nothing in the foreign currency field! So I have to delete the foreign currency amount in the local currency field and put the correct amount in. So I am effectively not using the exchange rate module for this transaction.
I just ended up putting in the amount showing on my bank statement. Not sure what is going on here! It was working for me before.