Here the conversion factor for the selected currency is shown. You also have the possibility to change the exchange rate directly when the supplier invoice is registered. If the conversion factor is changed, only the current supplier invoice will be affected.
By using the setting Suggested exchange rate during registration, under Accounts Payable under the Purchase tab in the Settings procedure, you can choose if the suggested exchange rate should be the current exchange rate or the exchange rate that applied during the date entered in the Invoice date.