To set the "Pricing Exchange rate type" in the billing document

Hello SAP Experts,

I have a customer requirement to determine the "pricing exchange rate" as "C Exchange rate determination according
to Billing date" in Billing documents ONLY for specific Sales Org and customer Country and NOT for ALL sales orgs.. This field is present in the Item level copy control setting.

This will ensure Exchange rate will be based on "Billing date" and NOT from date copied from Sales order for that specific Sales org.

Can I write this validation in the Billing document User-exit -RV60AFZC to achieve this functionality? Or there would be some Configuation required?

If anyone has worked upon this kind of requirement or know the method to achieve this, can you please help me?

Thanks in advance.

Umesh Karane.