PDF-12fatal
How to fix PDF-12
The XMP DocumentType is not INVOICE
A check of the PDF of a ZUGFeRD or Factur-X invoice, not of its XML. It runs when you upload a PDF; the embedded XML then gets the XSD and EN 16931 checks (XRechnung: also the KoSIT rules). Check your PDF with the ZUGFeRD validator or the Factur-X validator. What the PDF check covers.
What this rule checks
For an invoice or credit note, DocumentType in the XMP is INVOICE.
How to fix it
Set DocumentType to INVOICE.
Related rules
Validate your invoice
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