The buyer reference (BT-10) doesn't match the usual Leitweg-ID pattern — fine for B2B; public bodies usually expect one.
For public-sector invoices, request the Leitweg-ID from the buyer (pattern: 04011000-12345-03).
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-*).
