Delete/Void an Invoice which is in Approved status.

There might be a case where you need to delete an invoice after it is approved for payment. 

It could be that you realized that it is a duplicate invoice or it needs correction. 

The ideal way to do that is through credit memos but if that is not possible, you can do the following 

1. Go the invoice landing page and open the invoice by clicking on the invoice number 

2. Under actions, select Void an invoice 

3. After clicking on this option, you can enter comments on why you need to void the invoice.

4. Once the invoice is voided, you can't use the invoice for payment.