The last 9 digits of the French VAT number must match the seller's SIREN.
Reconcile master data — usually one of the two values is outdated or swapped.
The Billhorse validator checks XRechnung, ZUGFeRD and Factur-X right in your browser — your file is never uploaded.
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Rule source: EN 16931 / XRechnung (KOSIT) or Billhorse check (BH-*).
