Entering Invoices in Foreign Currency 
Use
An invoice in foreign currency exists if the currency in the invoice is different from the local currency defined for your company code.
The buyer enters the currency that is used when placing a purchase order with a foreign vendor in the purchase order itself. Usually you receive an invoice in the currency specified in the purchase order, but you can also enter the invoice in a different currency.
Prerequisites
Before you can enter an invoice in foreign currency, the following settings must be made in your system:
Procedure
You enter an invoice in foreign currency as follows:
The system compares your entry with the exchange rate entered in the purchase order and in Customizing:
.See also:
Foreign Currency Translation Parallel Currencies