Peppol BIS Billing 3.0 requires the seller's electronic address (BT-34, EndpointID with schemeID) — without it, routing in the Peppol network fails.
UBL: <cbc:EndpointID schemeID="…"> under the seller's cac:Party (e.g. schemeID 9930 for a German VAT id). CII: ram:URIUniversalCommunication/ram:URIID.
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Rule source: EN 16931 / XRechnung (KOSIT) or Billhorse check (BH-*).