Hi. You can assign a currency code at the time you enter an invoice, or let the system assign the default currency code from the customer record. When you enter an invoice, the system multiplies the foreign gross amount by the exchange rate to determinethe domestic gross amount. The default exchange rate is from the F0015 table. You can override this rate when you enter the invoice.
You also need to set the processing options of the standard invoice entry program and the invoice entry MBF to perform multicurrency invoice processing.
Keep in mind that there is setup to be configured, such as the processing options mentioned above as well as the P0015A exchange rates, and currency in the customer master record if desired to use that method.