Exchange rate type for vendor invoice

Hi,

How to know which exchange rate type is being considered during postings vendor invoice in foreign currency.

Company code currency is EUR and I am posting an invoice in USD.

I checked OB08 and exchange rate with type M does not match with one calculated in FB60.

I checked document type KR (OBA7) -exchange rate type 'M' is mentioned.

I checked additional currencies for company code (OB22) - all currencies use exchange rate type 'M'

So how to check which exchange rate type is being used by system.

Thanks.