Exchange Rate fields

Currency: Currency is mandatory in Create mode when the List of Exchange Rates was accessed from the List of Exchange Rate Groups and will be read-only in all other cases. Refers to an entry in the Currency table.
Exchange Rate Group: Exchange Rate Group is mandatory in Create mode when the List of Exchange Rates was accessed from the List of Currencies and will be read-only in all other cases. Refers to an entry in the Exchange Rate Group table.
Exchange Rate: The rate by which a monetary amount would have to be multiplied to compute the equivalent amount in the base currency. It can be modified in Update mode.
Effective Date: The effective date for the exchange rate. If not defined, the exchange rate is applicable from the earliest possible date. It can be modified in Update mode. Date ranges cannot overlap for the same currency and exchange rate group combination.
Expiration Date: The expiration date for the exchange rate. If not defined, the exchange rate is applicable until the latest possible date. It can be modified in Update mode. Date ranges cannot overlap for the same currency and exchange rate group combination.