Here you can select a default currency code for the customer. To see the currency codes in the Currencies window, click the AssistButton in the field.
This is the currency code that the program will suggest when you create sales documents or journal lines for the customer. You can change the currency code on sales documents and journal lines if the customer wishes to order in a different currency.
You can create customer invoices in any currency. If you invoice a customer in more than one currency, the program will show the currency of each entry in the resulting customer ledger entries.
You can change the customer's default currency as necessary.