If you saved an invoice as draft, or pro forma, you can convert it to a normal sales invoice.

This updates all your ledger and customer balances.

1. Go to Sales and select Sales Invoices.
2. Search for the pro forma or draft.
   
   TIP:

   Select More and change the Status to Draft or Pro Forma.

3. Select the invoice to open it and make any required changes.
4. Remove the tick from the Save as: checkbox.
   
5. Select Save to convert into an invoice.