Most invoicing solutions claim Factur-X compliance.
Few actually pass all three validation levels.
The three levels
Factur-X conformity requires passing all of these:
- XSD validation — XML structure is syntactically correct
- Schematron validation — EN16931 business rules are respected
- PDF/A-3 validation — the PDF document is archivable with the XML correctly embedded
Where most solutions fail
PDF/A-3 is the real problem.
Common PHP PDF libraries — Dompdf, TCPDF — produce DeviceRGB without ICC OutputIntent.
The XML can be perfectly structured. The invoice is still rejected.
The combination that works
- mPDF generates clean PDF/A-1b output
- factur-x (Python) injects the EN16931 XML and converts to PDF/A-3
Result: XSD ✅ Schematron ✅ PDF/A-3 ✅
Full note → https://palks-studio.com/en/electronic-invoicing-compliance
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