The root element is neither UBL Invoice/CreditNote nor CII CrossIndustryInvoice.
Check whether this is a different national format (e.g. FatturaPA) — those are not EN 16931 documents.
The Billhorse validator checks XRechnung, ZUGFeRD and Factur-X right in your browser — your file is never uploaded.
billhorse.comRule source: EN 16931 / XRechnung (KOSIT) or Billhorse check (BH-*). · All validation rules · Back to the validator