errorPEPPOL_BIS

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

A date field is not in the correct format. All dates must be YYYY-MM-DD (e.g., 2026-01-15).

We can fix this automatically

AUTO-FIX

1. Parse date from various formats. 2. Reformat to YYYY-MM-DD. 3. Remove any time component.

No manual changes needed
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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.

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

Frequently Asked Questions

A date field is not in the correct format. All dates must be YYYY-MM-DD (e.g., 2026-01-15).
A date field is not in the correct format. All dates must be YYYY-MM-DD (e.g., 2026-01-15). You can also use Invoice Navigator's automatic Fixer tool to correct this instantly.
Yes, PEPPOL-EN16931-F001 is a critical error that will cause invoice rejection. It must be fixed before submission to ensure your invoice is accepted.
Many instances of PEPPOL-EN16931-F001 can be automatically corrected using Invoice Navigator's Fixer tool. Upload your invoice and the tool will identify and fix common issues.

Last updated: 16 January 2026

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