KSEF-004
Error Guide
🇵🇱 KSEF-004: Currency code invalid in Poland
ErrorMandatoryNeeds Input
Currency must be a valid ISO 4217 code. Use PLN for domestic invoices.
Quick Facts
Severity
Error (rejection)
Ruleset
KSeF
Mandate
B2B Mandatory
Fix Type
Needs input
Why This Matters in Poland
Poland requires e-invoicing using KSeF XML format. Invoices with this error will be rejected. They cannot be processed for Poland compliance.
Invoice Navigator covers 134 KSeF FA(2) rules for Poland. Auto-remediates 78% of top rejection errors.
How to Fix KSEF-004
Poland E-Invoicing Requirements
Phase
Status
Scope
KSeF voluntary
Live (Jan 2022)
All VAT payers (opt-in)
B2B mandatory
Live (Feb 2026)
All Polish VAT payers
B2G
Live (Feb 2026)
Included in general KSeF mandate
Common Causes
- •Invalid currency code format
- •Using currency symbol instead of code
- •Typo in currency code
Fix KSEF-004 automatically
Upload your invoice and let Invoice Navigator auto-remediate this error.