BR-DE-15 XRechnung Error Explained: Missing Buyer Reference Field BT-10

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Developers generating XRechnung invoices may encounter a fatal BR-DE-15 validation error from the KoSIT validator, which is not a tool malfunction. The error indicates that the buyer reference field BT-10 is absent from the invoice. For German public sector invoices, this field must contain the Leitweg-ID, while business-to-business invoices should use whatever reference was agreed upon with the buyer. The fix requires setting the invoice.buyer_reference field in the submitted data. A dedicated documentation page and a free XML validation tool are available for developers who need to check compliance without creating an account.

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