errorPOLKSeF

KSEF-010:KSeF XML schema validation failed

Invoice XML must conform exactly to the FA schema version (FA/1 or FA/2). Even minor deviations cause rejection.

Fix this in your source system

MANUAL

The invoice XML does not conform to the KSeF FA schema (FA/1 or FA/2). Schema validation failures indicate fundamental structural issues that cannot be automatically corrected. Your invoicing software must be updated to generate KSeF-compliant XML. Contact your software vendor for KSeF compliance updates.

See the step-by-step instructions below to fix this error manually.

How to Fix It

Common Causes

  • Missing required elements
  • Invalid element order
  • Software not updated to latest schema

Frequently Asked Questions

Invoice XML must conform exactly to the FA schema version (FA/1 or FA/2). Even minor deviations cause rejection.
Validate XML against current FA schema before submission. You can also use Invoice Navigator's automatic Fixer tool to correct this instantly.
Yes, KSEF-010 is a critical error that will cause invoice rejection. It must be fixed before submission to ensure your invoice is accepted by the recipient's system.
Many instances of KSEF-010 can be automatically corrected using Invoice Navigator's Fixer tool. Upload your invoice and the tool will identify and fix common issues, including ksef xml schema validation failed.

Last updated: 19 January 2026

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