1. Once a customer's or vendor's currency is selected and transactions are posted, the customer's currency cannot be changed.
2. If transactions have already been posted using the wrong currency, void all invoices/payments that are posted.
3. Create a new vendor or customer record.
4. Ensure your currencies are set up accurately by following How can I add a foreign currency?
5. Create invoices for the new customer or vendor and let the program convert the invoice amount to foreign currency.

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