Bank exchange rate


I use the AX 4.0 with the localization for Eastern Europe.

I find in the form General Ledger - Setup - Exchange rate (table ExchRates) a button with the Bank exchange rate (table ExchRatesBank_W).

Can everybody explain me when I can use the bank exchange rate?

What’s the difference between the table ExchRates and ExchRatesBank_W?

If I populate the table ExchRatesBank_W with the exchange of Uni Credito Bank, when does the program use this table?

When the program use this table?

Thanks a lot