Exchange Rates - predefined form

Hello,

the currency of our application is EURO. We inserted the exchange rates using the web form Enter Exchange Rates - Single Period. In the image below, you can see that we use only 4 decimal places.

If we open the Exchange rate predefined form, we noticed that the decimal places are more than 4.

Is there a way to modify the decimal places calculated by the system?

Thanks

Alessandra