If the entire invoice is issued in a currency different from the house currency, the corresponding currency code is entered into the first tab of the invoice, the Voucher header data.
Which currency code is displayed depends on the selected bill-to-party due to the fact that the fields Payment term, Language and Currency are accepted from the address basic data of the invoice recipient.
These fields can be edited. Thus, invoices in foreign currencies can be sent to customers who usually receive Euro invoices.