The file cannot be parsed as XML.
Common causes: wrong character encoding (use UTF-8), unescaped & characters, truncated file.
The Billhorse validator checks XRechnung, ZUGFeRD and Factur-X right in your browser — your file is never uploaded.
Open the validator← All validation rules
Rule source: EN 16931 / XRechnung (KOSIT) or Billhorse check (BH-*).
