BT-1

Invoice number

BT-1 (Invoice number) 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.

Unique invoice identifier from the seller.

Cardinality: 1..1

UBL element: cbc:ID

Example value: INV-2026-001

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