Bank Foreign Currency Revaluation

HI ,

I have a doubt in running the Bank Foreign Currency Revaluation .

- The accounting currency is USD.

- I have created one bank with the currency as EUO.

Now my doubt is that when i run the Bank Foreign Currency Revaluation  from cash and bank what value i need to put 

USD to EUO 

or

EUO to USD

IF I use EUO to USD the report don't run.