Edition: Professional, Business, Enterprise
User-level: Director and above
If you've cancelled an invoice, and now wish to delete it - you can do so by following the below steps.
Open the Project >Financials > Invoices tab
Open the cancelled invoice > click the ellipsis button at the top right > select Delete
Click Delete on the confirmation pop-up
Note: Deleting the cancelled invoice also removes the linked cancel credit for that invoice, and deletion is tracked in the project audit located under the Project menu > Details > Audit
That's it! Now you can successfully delete any (cancelled) invoice.
An invoice can only be deleted if it is in CANCELLED status.
An invoice that has been credited at all cannot be deleted. If you've credited an invoice, the most you will be able to do is reverse that credit and then cancel the invoice. But you will not be able to delete it after that.