If you've saved an invoice with the wrong currency and it's not allowing you to edit it, follow these steps:

1. Open the Moon Invoice application on your smartphone or tap this link.
2. Navigate to Sales ➜ Invoices.
3. Select the invoice you want to edit.
4. If a payment is already added to this invoice, you need to delete the payment first:

• Open the invoice.
• Click on the Payment icon ($ dollar sign).
• Delete the added payment by tapping on ‘Trash’.

5. After deleting the payment, close the pop-up and tap on Edit.
6. Go to the Currency field and select the correct currency.
7. Tap Save to apply the changes.

Note: Currency editing is restricted if payments are already added to maintain accurate accounting records. Deleting the payment will unlock the currency field for editing.