BR-29

Where both the start and the end of the invoicing period are given, the end must fall on or after the start.

Severity: Error
Applies to: CII, UBL
Rule set: v2026-01-31

Official rule text

If both Invoicing period start date (BT-73) and Invoicing period end date (BT-74) are given then the Invoicing period end date (BT-74) shall be later or equal to the Invoicing period start date (BT-73).

Why does BR-29 happen?

The period is filled from two fields maintained separately. A typo in the year, or an end date left over from the previous month, reverses the order.

How do you fix BR-29?

Check the order before writing cac:InvoicePeriod in UBL, ram:BillingSpecifiedPeriod in CII. A single-day period with identical start and end is permitted.

In the XML

A UBL fragment. The CII path is named above — same change, different element names.

Fails

<cac:InvoicePeriod>
  <cbc:StartDate>2026-08-01</cbc:StartDate>
  <cbc:EndDate>2026-07-31</cbc:EndDate>
</cac:InvoicePeriod>

Fixed

<cac:InvoicePeriod>
  <cbc:StartDate>2026-08-01</cbc:StartDate>
  <cbc:EndDate>2026-08-31</cbc:EndDate>
</cac:InvoicePeriod>

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