Reference

BR-30 Invoice line period end must not precede its start

If both Invoice line period start date (BT-134) and Invoice line period end date (BT-135) are given, BT-135 shall be later than or equal to BT-134.

Problem Description

If both Invoice line period start date (BT-134) and Invoice line period end date (BT-135) are given, BT-135 shall be later than or equal to BT-134.

ERROR

XRechnung 3.0

Context and Significance

This rule comes from the EN16931 core semantic model enforced by the KoSIT XRechnung 3.0.2 Schematron, ensuring invoices carry the mandatory data needed for automated processing.

Solution

Correct cac:InvoiceLine/cac:InvoicePeriod so cbc:EndDate is on or after cbc:StartDate, or remove the line period if not needed.

Validate XML Convert invoice

Valid Examples

Use these points as the practical checks for this section.

BT-134 = 2026-02-01, BT-135 = 2026-02-28

Invalid Examples

Use these points as the practical checks for this section.

BT-134 = 2026-02-28, BT-135 = 2026-02-01 — end before start

Code Examples

Valid XML

<cac:InvoiceLine>
  <cac:InvoicePeriod>
    <cbc:StartDate>2026-02-01</cbc:StartDate>
    <cbc:EndDate>2026-02-28</cbc:EndDate>
  </cac:InvoicePeriod>
</cac:InvoiceLine>

Invalid XML

<cac:InvoiceLine>
  <cac:InvoicePeriod>
    <cbc:StartDate>2026-02-28</cbc:StartDate>
    <cbc:EndDate>2026-02-01</cbc:EndDate>
  </cac:InvoicePeriod>
</cac:InvoiceLine>

Affected Fields

BT-134 Invoice line period start date

BT-135 Invoice line period end date

Validation Tools

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