How do I credit a supplementary Invoice?

There are two ways to handle this:

1. Credit the Main Invoice: This method credits the entire main invoice, including any supplementary invoices associated with it.

2. Raise a Supplementary Invoice: Alternatively, you can raise another supplementary invoice with a credit value as described below. After entering the details, click Add and then Invoice. 

Important: Ensure that the stock record is open before creating a supplementary invoice to avoid any issues with the process.

This will generate a credit note, as shown.