Should you accept this invoice? Post a Factur-X PDF, CII or UBL XML and get a deterministic EN 16931 verdict: XSD conformance, every violated business rule by its official BR id with observed vs expected values, Factur-X profile consistency, and syntax checks on IBAN, SIREN/SIRET and VAT identifiers. The formats mandated by the French 2026-2027 reform. A non-conformant invoice is a paid, documented answer - no LLM guesswork. Add ?ruleset=xrechnung or ?ruleset=peppol to layer a national CIUS pack on top of the EN 16931 base: XRechnung (German BR-DE rules, DE mandate) or Peppol BIS Billing 3.0 (BE mandate, live since 2026-04), each violation sourced by its official id (BR-DE-xx, PEPPOL-EN16931-Rxxx).

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