# BT-155 — Item seller's identifier

> https://billhorse.com/en/terms/bt-155/

The item number from the seller's system (SKU). Useful for queries and reorders.

## Where does it live in the XML?

- UBL: `cac:InvoiceLine/cac:Item/cac:SellersItemIdentification/cbc:ID`
- CII: `ram:SpecifiedTradeProduct/ram:SellerAssignedID`