Different currency in Commercial invoice and Export excise invoice

Dear All,

Our company wants have EURO currency till commercial billing.

Of course, we need to maintain INR for Excise invoice and ARE1.

But Excise invoice will be created with reference to Commercial invoice only.

Then how this currency conversion will happen?

Is it enough if we maintain exchange rate only?

Since the commercial invoice is in EURO, by default the same currency should be copied to "Excise invoice". or By defualt system will create Excise invoice and ARE1 document in INR only.

Please clarify.

Regards,

Mullairaja