To issue a credit note, you need to access the details of the relevant invoice. Invoices are available in the reservation details or through the document search tool in ZaK's section Payments>Documents.
↳ Link: ZaK > Payments > Documents
☞ Docs: ZaK - Reservation detail
On the ZaK page of the invoice detail, you will find the "CREDIT NOTE" button at the top right:
Every credit note is associated with an invoice. You can select the amount to reverse by choosing the specific invoice costs. Example:
The credit note header is the same as the relevant invoice. Like all other tax documents, credit notes are available in the Payments>Documents section. If you have enabled electronic invoicing, the credit notes will also be provided with the XML file, and you can send them to the SDI.
Can I issue a partial credit note?
It is not possible to issue a partial credit note by manually selecting the amount. The credit note can only be issued for the total amount of the reservation or for individual services (e.g. for a single room).
Why?
Because ZaK, after you have issued a credit note, immediately understands what remains to be invoiced: it understands for which services a document has not yet been issued and it is able to calculate the amounts correctly. If you issue a partial credit note, you lose this important automatism.
This also allows you to have a clearer and, therefore, easier to consult accounting system. Issuing credit notes with customized amounts would lead to the loss of this precision and easy consultation.
Our advice is to issue a total credit note, then correct the amounts in the reservation and then issue the invoice again.