# BT-18 — Invoiced object identifier

> https://billhorse.com/en/terms/bt-18/

Identifier of an invoiced object such as a meter number, subscription or insurance policy. Carried in both syntaxes via a document reference with type code 130.

## Where does it live in the XML?

- UBL: `cac:AdditionalDocumentReference/cbc:ID (DocumentTypeCode 130)`
- CII: `rsm:SupplyChainTradeTransaction/ram:ApplicableHeaderTradeAgreement/ram:AdditionalReferencedDocument/ram:IssuerAssignedID (TypeCode 130)`