# BT-124 — External document location

> https://billhorse.com/en/terms/bt-124/

A URL where the supporting document can be retrieved — the alternative to embedding it as binary (BT-125). Beware: external links must stay reachable long-term, so many recipients prefer BT-125.

## Where does it live in the XML?

- UBL: `cac:AdditionalDocumentReference/cac:Attachment/cac:ExternalReference/cbc:URI`
- CII: `ram:AdditionalReferencedDocument/ram:URIID`