Error code DE-R-015
The buyer reference is missing (German Peppol invoice)
When both seller and buyer are in Germany, a Peppol invoice must contain the buyer reference (BT-10).
The official rule
“If both supplier and customer are located in Germany, the element "Buyer reference" (BT-10) shall be provided.”
Official text, in the language the rule set publishes it in.
Fields named: BT-10
Common causes
- The buyer reference or Leitweg-ID is not stored on the customer.
- The field is filled in but not exported.
How to fix it
- Ask the customer for their reference (or Leitweg-ID) and store it on the customer.
Where to fix it in your software
- sevdesk: Kontakte › Kontakt › E-Rechnung Standard › Leitweg-ID (help page)
- Lexware Office:
Ergänze im Kontakt die Leitweg-ID und die Lieferantennummer.
(help page)
From each provider's own help page, read on 25 October 2026. Menus can change; we are not linked to these providers.
Wrong vs. right (UBL)
Wrong
<cbc:DocumentCurrencyCode>EUR</cbc:DocumentCurrencyCode> <cac:AccountingSupplierParty>
Right
<cbc:DocumentCurrencyCode>EUR</cbc:DocumentCurrencyCode> <cbc:BuyerReference>BESTELLUNG-4711</cbc:BuyerReference> <cac:AccountingSupplierParty>