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BR-02

Missing: invoice number (BT-1)

Validation rule of EN 16931 (CEN, rule set 1.3.16) · Level: Error

What the message means

Missing: invoice number (BT-1).

What the issuer needs to change

Add the invoice number.

Fields concerned

BT-1 invoice number

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Origin

Rule set: EN 16931 (CEN, rule set 1.3.16)
Syntax: CII, UBL
Level: Error

Original rule text

An Invoice shall have an Invoice number (BT-1).

Source: CEN/TC 434, EN 16931 validation rules 1.3.16, European Union Public Licence 1.2

Technical details for IT

UBL

Context: /ubl:Invoice | /cn:CreditNote
Test: not(normalize-space(cbc:ID) != '')

CII

Context: /rsm:CrossIndustryInvoice
Test: not(normalize-space(rsm:ExchangedDocument/ram:ID) != '')

Related rules

BR-01Missing: specification identifier (BT-24)
BR-03Missing: invoice date (BT-2)
BR-04Missing: invoice type code (BT-3)
BR-05Missing: invoice currency (BT-5)

All validation rules

Technical explanation by robin.vision, not tax or legal advice. Rules as of 31 August 2026 (KoSIT validator configuration).