Here you set a VAT refund credit invoice with “VAT only” display.
When you need to refund / correct VAT only with a credit invoice.
Open Settings → Tax connections → Variable mapping and fill the yellow myDATA fields on the related document / VAT. The basics are in the main myDATA mapping article.
On-screen steps
What the codes mean
Usually credit type 5.1 or 5.2, with price display “VAT only” as in the screenshots.