FX-XMP4 rules
The XMP block that tells a receiver this PDF is a Factur-X invoice, which file holds the data, and which profile it claims. A mismatch between the metadata and the invoice decides which set of fields is mandatory — in France, that matters.
| FX-XMP-01 | warning | A Factur-X PDF must carry XMP metadata declaring the document type, attachment filename and conformance level. |
| FX-XMP-02 | warning | The XMP metadata must contain the Factur-X or ZUGFeRD extension schema. |
| FX-XMP-03 | warning | The filename declared in the XMP metadata must match an actual attachment. |
| FX-XMP-04 | warning | The conformance level declared in XMP must match the guideline declared in the invoice XML. |
Nothing is stored, and the whole invoice is checked, not just this rule. A PDF only works if it is Factur-X / ZUGFeRD — a PDF with the invoice XML inside it.