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Fields & identifiers

Invoice number (BT-1)

The invoice number is the unique, sequentially assigned identifier of a document — it is required for VAT purposes, must never repeat, and is field BT-1 in EN 16931.

Also:
BT-1 · invoiceNumber · fortlaufende Nummer
Reviewed on 2026-08-26.

There is no long-form article for this term yet. The definition above is the complete entry; the related terms lead onwards.