errorPLubl-2.1
PL-R-003:KSeF submission required
Polish invoices must be submitted to KSeF (Krajowy System e-Faktur).
Fix this in your source system
MANUALPolish invoices must be submitted to KSeF (Krajowy System e-Faktur). This requires API integration with the Polish tax authority system and cannot be accomplished by modifying the invoice XML. Use invoicing software with KSeF integration, or submit manually through the KSeF portal.
See the step-by-step instructions below to fix this error manually.
Why This Error Matters
Polish B2B invoices must go through KSeF from 2026.
How to Fix It
1
Submit to KSeF
Via KSeF API or portal
2
Get reference
KSeF assigns unique number
3
Include reference
Add to invoice for recipients
Technical Details
XPath: Extension for KSeF referenceCommon Causes
- Not submitted to KSeF
- Missing KSeF reference
Frequently Asked Questions
Polish invoices must be submitted to KSeF (Krajowy System e-Faktur).
Submit invoice to KSeF and include reference number. You can also use Invoice Navigator's automatic Fixer tool to correct this instantly.
Yes, PL-R-003 is a critical error that will cause invoice rejection. It must be fixed before submission.
See Also
Related Errors
Last updated: 19 January 2026
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