How do I fix KSEF-004?

Use correct ISO 4217 currency code. Invoice Navigator detects this error and prompts for the required business data before applying a safe fix.

Is KSEF-004 a critical error?

Yes, KSEF-004 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.

Can KSEF-004 be automatically fixed?

KSEF-004 requires specific business data to resolve. Invoice Navigator detects the error and guides you through providing the needed information, then applies the fix with full audit documentation.

Error codes · KSeF · Poland

KSEF-004Fixable here

Currency code invalid

This is the rejection, word for word: „[KSEF-004] Currency must be a valid ISO 4217 code. Use PLN for domestic invoices.“

What to have readyCurrency Code

What we doUse correct ISO 4217 currency code.

Choose the rejected invoiceor drop it here

XRechnung XML or ZUGFeRD PDF. Checking is free · corrected file €1.90 · the first every 30 days is free · no sign-up.

What the finding looks likeExample

FindingValue missing · KSEF-004

From youCurrency Code

ThenPassed

ProofSHA-256 and /verify link after the check