# BT-157 — Item standard identifier

> https://billhorse.com/en/terms/bt-157/

A registered, cross-system item identifier such as a GTIN/EAN. The scheme is given as an attribute (e.g. schemeID 0160 for GTIN).

## Where does it live in the XML?

- UBL: `cac:InvoiceLine/cac:Item/cac:StandardItemIdentification/cbc:ID (@schemeID)`
- CII: `ram:SpecifiedTradeProduct/ram:GlobalID (@schemeID)`