Different Exchange Rate Type in Vendor Invoices

Hello All,

We are using  "M" - Average rate for all the FC transactions. Now the client has a requirement of using a different Exchange rate type for all the Vendor invoices posted through FB60. Can it be possible without mentioning the default Exchange rate type in the Document type ? Is there anything to be done in any FM to get a different Exchange rate type in FB60 ?

Thanks & Regards
Ramesh