# BG-4 — Seller

> https://billhorse.com/en/terms/bg-4/

All master data of the invoicing party: name, identifiers, tax registration and electronic address. This group is mandatory in every EN 16931 invoice.

## Where does it live in the XML?

- UBL: `cac:AccountingSupplierParty`
- CII: `ram:SellerTradeParty`

## Contained fields

- [BT-27 — Seller name](https://billhorse.com/en/terms/bt-27/)
- [BT-28 — Seller trading name](https://billhorse.com/en/terms/bt-28/)
- [BT-29 — Seller identifier](https://billhorse.com/en/terms/bt-29/)
- [BT-30 — Seller legal registration identifier](https://billhorse.com/en/terms/bt-30/)
- [BT-31 — Seller VAT identifier](https://billhorse.com/en/terms/bt-31/)
- [BT-32 — Seller tax registration identifier](https://billhorse.com/en/terms/bt-32/)
- [BT-33 — Seller additional legal information](https://billhorse.com/en/terms/bt-33/)
- [BT-34 — Seller electronic address](https://billhorse.com/en/terms/bt-34/)
- [BG-5 — Seller postal address](https://billhorse.com/en/terms/bg-5/)
- [BG-6 — Seller contact](https://billhorse.com/en/terms/bg-6/)

## Checked by these rules

- [BR-06 — Seller name missing](https://billhorse.com/en/rules/br-06/)
- [BR-CO-26 — Seller tax identifier missing](https://billhorse.com/en/rules/br-co-26/)
- [BH-FR-01 — Seller SIREN/SIRET missing (France)](https://billhorse.com/en/rules/bh-fr-01/)
- [BH-FR-02 — Seller identifier not a SIREN/SIRET](https://billhorse.com/en/rules/bh-fr-02/)
- [BH-FR-04 — French VAT number invalid](https://billhorse.com/en/rules/bh-fr-04/)
- [BH-FR-05 — SIREN in VAT number contradicts BT-30](https://billhorse.com/en/rules/bh-fr-05/)