Peppol BIS Billing 3.0 requires the buyer's electronic address (BT-49, EndpointID with schemeID) — it addresses the recipient in the Peppol network.
UBL: <cbc:EndpointID schemeID="…"> under the buyer's cac:Party. CII: ram:URIUniversalCommunication/ram:URIID on the BuyerTradeParty.
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Rule source: EN 16931 / XRechnung (KOSIT) or Billhorse check (BH-*).