Engine Classification
Financial or legal field · Modification blocked by policy
Reason: For split payment (podzielona płatność) invoices, the seller bank account must be registered on the Polish VAT white list (biała lista VAT). This cannot be fixed by modifying the invoice. The seller must register their bank account at https://www.podatki.gov.pl/wykaz-podatnikow-vat-wyszukiwarka/ or use a different registered bank account.
What is KSEF-009?
KSEF-009 is a warning validation rule defined in the KSeF specification (POL national rules).
The invoice may pass transmission, but this non-compliance can cause problems during tax audits or buyer-side processing.
Why This Error Matters
KSEF-009 is a soft failure that can cause issues at the receiving end — tax audits, ERP processing, or VAT reconciliation mismatches.
Validator Behavior
- ·Generates validation warning
- ·Error returned: KSEF-009
- ·Specification: KSeF
How to Fix It
Technical Reference
Common Causes
- ·Bank account not registered
- ·New bank account not yet added
- ·Using personal instead of business account
Seeing this in production? The API handles KSEF-009 automatically. See the fix response →
Frequently Asked Questions
For split payment (podzielona płatność) invoices, the seller bank account must be registered on the VAT white list (biała lista VAT).
Verify bank account is on VAT white list. This error involves a protected field — Invoice Navigator flags it in your pipeline so your team can correct it at the source.
KSEF-009 is a warning that may not always cause rejection, but it indicates a potential compliance issue that should be addressed to ensure full compatibility.
KSEF-009 involves a financial or legal field that cannot be auto-modified by policy. Invoice Navigator detects and flags this error immediately, but the correction must be made manually in your ERP or invoicing software.
Related Content
Last updated: 3 March 2026
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