You can only delete an invoice if it meets all the following conditions:

• The invoice is unpaid
• The invoice has no allocations
• The invoice isn't on a VAT Return

If the invoice has allocations, remove them before editing it by:

• Unallocating the customer receipt from the sales invoice, or
• Unallocating the credit note from the sales invoice

The invoice is on a VAT Return:

• If it's included on a draft VAT Return, delete the VAT Return before editing the invoice
• If it's included on a submitted VAT Return, you can't edit the invoice, instead reverse the sales invoice

Delete an invoice

1. From Sales, choose Sales Invoices.
2. Select the check box next to the relevant invoice.
3. Select Delete from the toolbar.
4. Enter the reason for deleting the invoice.
5. Choose Yes.