The seller needs a VAT identifier (BT-31) or tax registration (BT-32).
UBL: PartyTaxScheme/CompanyID (TaxScheme VAT for BT-31, FC for BT-32). CII: SpecifiedTaxRegistration/ID with schemeID VA or FC.
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-*).
