1. Find the invoice you wish to change in QuickBooks.
2. Click Edit > Delete Invoice.
3. Click the Invoice button located at the top of QX.
4. Select the Invoice you wish to change in the Invoice List.
5. Press Edit Invoices.
6. Make proper changes to invoice.
7. Click Post To QuickBooks > Invoices.
8. Click the Already sent to QB tab.
9. Only check the invoice you have currently sent to QuickBooks.
10. Click Post To QB.
The edited invoice will now display in QuickBooks without producing a duplicate copy.