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BR-21

In at least one invoice line, this is missing: invoice line identifier (BT-126)

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

What the message means

In at least one invoice line, this is missing: invoice line identifier (BT-126).

What the issuer needs to change

Give the invoice line identifier in every line.

Fields concerned

BG-25 invoice line
BT-126 invoice line identifier

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Origin

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

Original rule text

Each Invoice line (BG-25) shall have an Invoice line identifier (BT-126).

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

Technical details for IT

UBL

Context: cac:InvoiceLine | cac:CreditNoteLine
Test: not(normalize-space(cbc:ID) != '')

CII

Context: //ram:IncludedSupplyChainTradeLineItem
Test: not(normalize-space(ram:AssociatedDocumentLineDocument/ram:LineID) != '')

Related rules

BR-18Missing: seller tax representative name (BT-62)
BR-19Missing: seller tax representative postal address (BG-12)
BR-20Missing: tax representative country code (BT-69)
BR-22In at least one invoice line, this is missing: invoiced quantity (BT-129)
BR-23In at least one invoice line, this is missing: unit of measure (BT-130)
BR-24In at least one invoice line, this is missing: invoice line net amount (BT-131)

All validation rules

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