WALUTA_UMOWNA_PLN: WalutaUmowna must NEVER be 'PLN' (§13.1, Appendix D #10)

StandardKSeF FA(3), Polish national e-invoicing systemSeverityError: the invoice is rejectedSyntaxFA(3) XMLApplies toStructured invoices (FA(3) schema) submitted to the Polish KSeF. XSD codes come from the schema, semantic codes from the Ministry of Finance information sheet; KSeF rejects invoices that fail an error-level rule.

Official rule text

[WALUTA_UMOWNA_PLN] WalutaUmowna must NEVER be 'PLN' (§13.1, Appendix D #10)

Why this error occurs

KSeF checks the FA(3) XML in two stages: XSD schema (structure, element order, data types, patterns such as NIP or dates) and semantic rules from the Ministry of Finance information sheet (consistency of amounts, annotations P_16 to P_23, roles of Podmiot2/Podmiot3, bank account formats, currency rates).

How to fix it

Fix the element named in the message. For XSD errors compare the element order and value pattern with the FA(3) schema; for semantic errors apply the cause and fix hints listed on this page. Re-validate before submitting to KSeF: a rejected invoice has no KSeF number and is not issued.

What the validator checks

Check levelsemantic / business_logic

Typical causes

PLN incorrectly used in contract currency field

Check your invoice

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Same check via API:

curl -F file=@invoice.xml https://einvoicechecker.com/v1/validate

Related rules

CURRENCY_RATE_MISMATCH KursWaluty does not match the NBP Table A mid-rate for the reference date (Art
CURRENCY_RATE_UNVERIFIABLE KursWaluty cannot be verified — NBP rate unavailable or outside the valid date window (Art
FOREIGN_CURRENCY_TAX_PLN Foreign currency invoice with tax amounts should include PLN conversions in P_14_*W…
KURS_WALUTY_Z_PLACEMENT KursWalutyZ at Fa level is ONLY valid for advance invoices (RodzajFaktury = ZAL or…
NEGATIVE_QUANTITY_NOT_ALLOWED Negative quantities (P_8B) are only allowed in corrective invoices (RodzajFaktury =…
NIP_IN_WRONG_FIELD Polish NIP detected in NrVatUE field - must be in NIP field for purchaser KSeF access…
OO_RATE_FOREIGN_BUYER P_12 = 'oo' is for domestic reverse charge only
P12_ENUMERATION P_12 must be one of

Frequently asked questions

What does WALUTA_UMOWNA_PLN mean?

WALUTA_UMOWNA_PLN is a ksef fa(3) rule: WalutaUmowna must NEVER be 'PLN' (§13.1, Appendix D #10)

Will my invoice be rejected because of WALUTA_UMOWNA_PLN?

Yes. WALUTA_UMOWNA_PLN is flagged "fatal"; validators (KoSIT, Peppol access points, the German ZRE/OZG-RE portals, KSeF) reject the invoice until it is fixed.

Which formats does WALUTA_UMOWNA_PLN apply to?

Structured invoices (FA(3) schema) submitted to the Polish KSeF. XSD codes come from the schema, semantic codes from the Ministry of Finance information sheet; KSeF rejects invoices that fail an error-level rule. Syntax: FA3.

Source: KSeF FA(3) schema 1-0E + semantic rules (@ksefuj/validator 0.4). Catalogue generated from the official rule sets on 2026-10-15.