French invoices require the seller's legal registration identifier (BT-30, SIREN or SIRET).
CII: SpecifiedLegalOrganization/ID with schemeID 0002 (SIREN) or 0009 (SIRET). UBL: PartyLegalEntity/CompanyID.
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Rule source: EN 16931 / XRechnung (KOSIT) or Billhorse check (BH-*).
