BT-12

Contract reference

BT-12 (Contract reference) is a business term of EN 16931, the European e-invoicing standard. This page shows where the field lives in a UBL invoice, how often it may appear and which validation rules check it.

Contract the invoice refers to.

Cardinality: 0..1

UBL element: cac:ContractDocumentReference/cbc:ID

Example value: CTR-2026-9

Browse the interactive EN 16931 mapper Check your invoice in the free validator