Creating and applying a Credit Note is a two-step process. Firstly, you need to create the Credit Note against the Customer and then secondly, apply the Credit Note as a Payment against an existing Invoice.
Creating a Credit Note for a Customer
...
Creating and applying a Credit Note is a two-step process. Firstly, you need to create the Credit Note against the Customer and then secondly, apply the Credit Note as a Payment against an existing Invoice.
...