Cancel or credit invoice

How to cancel an invoice is explained here:

Delete and cancel documents

Cancellation invoice or credit invoice?

Usually an invoice that is invalid is canceled with a cancellation invoice. In doing so, a document with negative values is simply created.

In certain individual cases - consult your tax advisor about this - it may also make sense to convert an invoice into a credit invoice.

This can be done via the "Options" tab in the "Copy document" box.

Copy document or convert it into another document