A routing identifier assigned by the buyer for internal routing purposes
While BT-10 is optional in the European EN16931 standard, it is mandatory for all XRechnung invoices to German public authorities. This is a German-specific requirement (CIUS).
Essential for routing invoices to correct department in German public administration
Mandatory for all XRechnung invoices to German authorities since November 27, 2020
/Invoice/cbc:BuyerReferenceFull UBL context:
<Invoice xmlns="urn:oasis:names:specification:ubl:schema:xsd:Invoice-2">
<cbc:ID>INV-2025-001</cbc:ID>
<cbc:IssueDate>2025-01-27</cbc:IssueDate>
<cbc:BuyerReference>991-12345-67</cbc:BuyerReference>
<!-- Other elements -->
</Invoice>/CrossIndustryInvoice/SupplyChainTradeTransaction/ApplicableHeaderTradeAgreement/ram:BuyerReference991-12345-67992-BW-FINANZ-2024993-MUC-EDU-00104011000-26158-0112345✗ InvalidDE-991-12345✗ Invalid991_12345_67✗ Invalid991-12345-67-89-01✗ InvalidYes. For invoices to German public authorities, the Buyer Reference (Leitweg-ID) is mandatory.
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