This is very important form that used to enter exchange rates of every currency in every month and every year. This data is used in most of reports. 
Select: Country, Year, Month. 
Enter: Rate vs USD.
Notes:
- The form doesn't allow to enter duplicated data – you'll receive an error 
- “Rate vs USD” can be enough long value like “2.2445607801” or longer. But in most reports the exchange rate is shown with 5 digits after the floating point.  
- If the rate of the month / year was not entered – any report will use default exchange rate value from the  country-  table. Beware this value can be very far from the actual exchange rate especially in the country with high inflation. 
To edit existing exchange rates hit on “Edit” button.
