Creating Credit Notes with Negative Amount

Some of our Clients are insisting to generate the Credit Notes with Negative Amount, and it to has to be reflected in the QR Code in Negative Amount.
As we informed them that Invoices/Credit Note/Debit Note amount must be positive, but they are insisting that it is mandatory from Zatca. Can you please clarify this, so we can inform this to our clients.

Dear Taxpayer,

Credit Notes by nature imply a negative adjustment to the Original Tax Invoice. The rules are clear about the XML that all the values must be positive even in Credit Note.