Cause
The account (or accounts) for registering foreign exchange rate differences are not indicated in the File and accounting properties (File menu), section foreign currency. The Recalculate totals command, updates the Calculated Balance column using the latest exchange rate of the Exchange Rate table and reports eventual exchange rate profit or loss to the exchange rate difference account.
Solution
To allow the program to report automatically eventual exchange rate differences, it is necessary to insert the account or accounts destined to register exchange rate differences in the File properties, Foreign exchange tab.