Make sure that the option to Use Foreign Exchange Functions has been activated. Go to Administration > System Initialization > Eralis Job. To activate the field, go to the General tab; the field is at the bottom of the screen.
For a customer that has been setup as a foreign currency customer, some additional fields are available on the Invoicing tab of the job. There is an option to select either the Business Partner currency or the system currency to invoice in. If the Business Partner currency is chosen, then the currency code is shown in the next field and then the exchange rate from the system setup. The exchange rate can be overwritten if required.
The pricing that is shown on the joblines, is ALWAYS in the local currency. Therefore, when the invoice is raised, the individual values in the Price after Discount field are multiplied by the exchange rate to give the invoiceable total in the foreign currency.