All master data of the invoicing party: name, identifiers, tax registration and electronic address. This group is mandatory in every EN 16931 invoice.
cac:AccountingSupplierPartyram:SellerTradePartyBT-27 Seller nameBT-28 Seller trading nameBT-29 Seller identifierBT-30 Seller legal registration identifierBT-31 Seller VAT identifierBT-32 Seller tax registration identifierBT-33 Seller additional legal informationBT-34 Seller electronic addressBG-5 Seller postal addressBG-6 Seller contactBR-06 Seller name missingBR-CO-26 Seller tax identifier missingBH-FR-01 Seller SIREN/SIRET missing (France)BH-FR-02 Seller identifier not a SIREN/SIRETBH-FR-04 French VAT number invalidBH-FR-05 SIREN in VAT number contradicts BT-30The Billhorse validator checks XRechnung, ZUGFeRD and Factur-X right in your browser — your file is never uploaded.
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Semantics: EN 16931-1. Simplified explanation in our own words — the norm is authoritative.