# BT-47 — Buyer legal registration identifier

> https://billhorse.com/en/terms/bt-47/

The buyer's official registration number, analogous to BT-30 on the seller side. The scheme is given via the schemeID attribute.

## Practical note

France: from 2026-09-01 the buyer's SIREN is mandatory on B2B invoices — it drives routing via the certified platforms (PDP). The SIREN is publicly searchable in the SIRENE register.

## Where does it live in the XML?

- UBL: `cac:AccountingCustomerParty/cac:Party/cac:PartyLegalEntity/cbc:CompanyID`
- CII: `rsm:SupplyChainTradeTransaction/ram:ApplicableHeaderTradeAgreement/ram:BuyerTradeParty/ram:SpecifiedLegalOrganization/ram:ID`

## Checked by these rules

- [BH-FR-03 — Buyer SIREN missing (France, from 09/2026)](https://billhorse.com/en/rules/bh-fr-03/)