The seller's own order number for the same transaction — the counterpart to the buyer's purchase order (BT-13).
cac:OrderReference/cbc:SalesOrderIDrsm:SupplyChainTradeTransaction/ram:ApplicableHeaderTradeAgreement/ram:SellerOrderReferencedDocument/ram:IssuerAssignedIDThe Billhorse validator checks XRechnung, ZUGFeRD and Factur-X right in your browser — your file is never uploaded.
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Semantics: EN 16931-1. Simplified explanation in our own words — the norm is authoritative.