# BT-26 — Preceding invoice issue date

> https://billhorse.com/en/terms/bt-26/

Issue date of the referenced preceding invoice (BT-25). Useful when the invoice number alone is not unambiguous.

## Where does it live in the XML?

- UBL: `cac:BillingReference/cac:InvoiceDocumentReference/cbc:IssueDate`
- CII: `rsm:SupplyChainTradeTransaction/ram:ApplicableHeaderTradeSettlement/ram:InvoiceReferencedDocument/ram:FormattedIssueDateTime/qdt:DateTimeString`