New fields to populate the exchange rate

In the latest SDK (3.3.3) release notes it mentions that exchange rate can be given in case of invoices issued in a foreign currency:

" * Adding new fields to populate the exchange rate (source currency, target currency and exchange rate) in case the invoice is issued with foreign currency.
Note: The position for the exchange rate UBL tags should come immediately after the UBL tag cac:AllowanceCharge at the document level."

I’m wondering if there are any sample XML-files for this?