How do I delete an invoice?
You should only delete an invoice if it was created in error. In this situation, the 'Change Invoice Status' button (the circular arrow symbol) gives you the option to delete an invoice.
In other circumstances, where the invoice wasn't created in error but you now want to 'cancel', 'reduce' or 'write off' the invoice, you need to either:
a) Issue a credit note (see this help article), or
b) Write-off the debt (see this help article).
To help you better understand the invoicing module as a whole, please visit the module overview page here.