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BR-CO-20

An invoice line period (BG-26) is present but has no date

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

What the message means

An invoice line period (BG-26) is present but has no date.

What the issuer needs to change

Give the start date, end date or both.

Fields concerned

BG-26 invoice line period
BT-134 invoice line period start date
BT-135 invoice line period end date

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Origin

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

Original rule text

If Invoice line period (BG-26) is used, the Invoice line period start date (BT-134) or the Invoice line period end date (BT-135) shall be filled, or both.

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:InvoicePeriod | cac:CreditNoteLine/cac:InvoicePeriod
Test: not(exists(cbc:StartDate) or exists(cbc:EndDate))

CII

Context: //ram:SpecifiedLineTradeSettlement/ram:BillingSpecifiedPeriod
Test: not((ram:StartDateTime) or (ram:EndDateTime))

Related rules

BR-CO-17A VAT amount (BT-117) does not match the taxable amount (BT-116) and rate (BT-119)
BR-CO-18The invoice has no VAT breakdown (BG-23)
BR-CO-19An invoicing period (BG-14) is present but has no date
BR-CO-21An allowance has no reason (BT-97 or BT-98)
BR-CO-22A charge has no reason (BT-104 or BT-105)
BR-CO-23A line allowance has no reason (BT-139 or BT-140)

All validation rules

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