errorbusinessPeppol BIS 3.0

`PEPPOL-EN16931-F001`:A date MUST be formatted YYYY-MM-DD.

Fix: Invoice Navigator automatically fixes this Invoice compliance issue by updating the relevant XML elements (PEPPOL-EN16931-F001). Upload your invoice to fix this automatically.

A date MUST be formatted YYYY-MM-DD. This validation rule ensures Invoice compliance with Peppol BIS 3.0.

Severity

Fatal

Rule set

Peppol BIS 3.0

Country

All EU

Fix type

AUTO-FIX

Confidence

85%

Engine Classification

Recalculate invoice monetary totals per Peppol rules

Confidence: 85% · Applied automatically in pipeline

What is PEPPOL-EN16931-F001?

PEPPOL-EN16931-F001 is a fatal validation rule defined in the Peppol BIS 3.0 specification. It validates the LegalMonetaryTotal element in the UBL invoice XML.

When this rule fires, the invoice is rejected by Peppol access points and never reaches the buyer.

Target path: //cac:LegalMonetaryTotal

Fix this error

Why This Error Matters

Invoice will be rejected by PEPPOL validators. PEPPOL BIS Billing enforces specific format, type code, and VAT exemption code consistency requirements.

PEPPOL-EN16931-F001 is a hard failure — the invoice must be corrected and re-sent before it can reach the recipient.

Invoice Navigator can automatically correct this error in your pipeline. The fix is applied with full audit evidence, so your compliance trail remains intact.

Validator Behavior

·Causes invoice rejection
·Rejected by PEPPOL Access Points
·Error returned: PEPPOL-EN16931-F001
·Specification: Peppol BIS 3.0

How to Fix It

Identify the calculation mismatch

Check cac:LegalMonetaryTotal at //cac:LegalMonetaryTotal. The value does not match the expected sum or formula result.

Recalculate the value

Invoice Navigator automatically fixes this Invoice compliance issue by updating the relevant XML elements (PEPPOL-EN16931-F001).

Re-validate your invoice

Upload the corrected invoice to confirm PEPPOL-EN16931-F001 is resolved. Calculation errors can cascade — check related totals too.

Before / After

Failing XML

<Invoice>
  <!-- Issue: A date MUST be formatted YYYY-MM-DD -->
</Invoice>

Corrected XML

<Invoice>
  <!-- Issue resolved per Peppol BIS 3.0 -->
</Invoice>

Technical Reference

XPath//cac:LegalMonetaryTotal

SpecPeppol BIS 3.0

Operationrecalculate

StrategyRecalculate invoice monetary totals per Peppol rules

Common Causes

·Date field not in YYYY-MM-DD format
·Date uses wrong format like DD/MM/YYYY or MM-DD-YYYY
·cbc:IssueDate or similar date element malformed
·ISO 8601 date format not followed
·ERP exports date in locale-specific format instead of ISO

Seeing this in production? The API handles PEPPOL-EN16931-F001 automatically. See the fix response →

Frequently Asked Questions

A date MUST be formatted YYYY-MM-DD. This validation rule ensures Invoice compliance with Peppol BIS 3.0.

Invoice Navigator automatically fixes this Invoice compliance issue by updating the relevant XML elements (PEPPOL-EN16931-F001). You can also use Invoice Navigator's compliance engine to correct this automatically in your pipeline.

Yes, PEPPOL-EN16931-F001 is a critical error that will cause invoice rejection. It must be fixed before submission.

Many instances of PEPPOL-EN16931-F001 can be automatically corrected using Invoice Navigator's compliance engine. The fix is applied in your pipeline with full audit evidence.

Validate your invoice

Drop your XML here to check for PEPPOL-EN16931-F001

Upload XML

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Upload your invoice and we fix this error automatically. Financial fields are never touched.

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PEPPOL-EN16931-F001:A date MUST be formatted YYYY-MM-DD.