How do I fix KSEF-006?

Use Polish unit codes from the official classification. Invoice Navigator detects this error and prompts for the required business data before applying a safe fix.

Is KSEF-006 a critical error?

Yes, KSEF-006 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-006 be automatically fixed?

KSEF-006 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-006Fixable here

Unit code not recognized

This is the rejection, word for word: „[KSEF-006] Unit of measure must be from Polish classification. Common codes include szt. (piece), kg, m, l, usł. (service).“

What to have readyUnit of Measure

What we doUse Polish unit codes from the official classification.

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-006

From youUnit of Measure

ThenPassed

ProofSHA-256 and /verify link after the check