In the case a credit invoice was created earlier but is incorrect, you can delete this credit invoice.
Tip: the "C" in the invoice number indicates that it is a credit invoice.
To delete a credit invoice follow these steps:
Open menu > finance > quotes & invoices > invoices
Search for the credit invoice. You can use the search bar to type in the credit invoice number or patient details.
Select 'delete' on the right side of the row.
Note: deleting a credit invoice, makes the original invoice applicable.