XRechnung requires the buyer reference (BT-10). For invoices to German public bodies this is the Leitweg-ID.
UBL: populate <cbc:BuyerReference>. Public buyers provide their Leitweg-ID; for B2B any buyer reference is acceptable.
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billhorse.comRule source: EN 16931 / XRechnung (KOSIT) or Billhorse check (BH-*). · All validation rules · Back to the validator