E-Invoice Error Reference

1350+ documented errors for Peppol, UBL, CII, and EN16931 validation errors.

Business RulesCountry-SpecificSyntax ErrorsFormat Rules
CountryFranceGermanyItalyNetherlandsBelgiumSpainPoland

19 errors found for Poland

warningPL-R-007POLubl-2.1INPUT

Split payment annotation required

High-value Polish invoices may require split payment notation.

errorKSEF-010POLKSeFBLOCKED

KSeF XML schema validation failed

Invoice XML must conform exactly to the FA schema version (FA/1 or FA/2). Even minor deviations cause rejection.

errorPL-R-003POLubl-2.1BLOCKED

KSeF submission required

Polish invoices must be submitted to KSeF (Krajowy System e-Faktur).

warningKSEF-009POLKSeFBLOCKED

Bank account not on VAT white list

For split payment (podzielona płatność) invoices, the seller bank account must be registered on the VAT white list (biała lista VAT).

errorPL-R-004POLubl-2.1BLOCKED

KSeF session token invalid

KSeF API requires valid authentication token.

errorPL-R-005POLubl-2.1INPUT

Invalid Polish NIP format

Polish NIP must be 10 digits with valid checksum.

errorPL-R-006POLubl-2.1BLOCKED

Currency must be PLN for KSeF

Invoices to Polish KSeF typically require PLN amounts.

errorKSEF-005POLKSeFBLOCKED

VAT rate invalid for item type

Polish VAT rates (23%, 8%, 5%, 0%, ZW-exempt, NP-not subject) must match item classification rules per Polish VAT law and PKWiU classification.

errorKSEF-006POLKSeFINPUT

Unit code not recognized

Unit of measure must be from Polish classification. Common codes include szt. (piece), kg, m, l, usł. (service).

errorKSEF-007POLKSeFBLOCKED

Date format invalid

All dates in KSeF invoices must be in YYYY-MM-DD (ISO 8601) format. Other formats are rejected.

warningKSEF-008POLKSeFINPUT

GTU code missing

Certain goods/services require GTU (Grupy Towarów i Usług) classification codes. Required for alcohol (GTU_01), fuel (GTU_02), heating oil (GTU_03), tobacco (GTU_04), and other specific categories.

errorBR-PL-01POLpeppol-bis-3INPUT

Polish NIP number required

Polish invoices must include the NIP (tax identification number) for seller and buyer.

errorBR-PL-02POLksefBLOCKED

Invalid KSeF invoice type

Polish KSeF invoices must use valid invoice type codes.

errorKSEF-001POLKSeFINPUT

NIP validation failed

Polish NIP (tax identification number) must be 10 digits with valid checksum. Both seller and buyer NIP are required for B2B invoices. Leading zeros are significant.

errorKSEF-002POLKSeFBLOCKED

Invoice date too old for KSeF

Invoice issue date cannot be more than 30 days before KSeF submission date. Older invoices will be rejected by the system.

errorKSEF-003POLKSeFBLOCKED

Invoice number sequence gap

Invoice numbers must be sequential without gaps within each calendar year. KSeF rejects invoices with numbering gaps or duplicates.

errorKSEF-004POLKSeFINPUT

Currency code invalid

Currency must be a valid ISO 4217 code. Use PLN for domestic invoices.

warningPL-01POLCIUS-PL (Poland)BLOCKED

Polish sellers should include NIP number

Polish sellers should include NIP number. This validation rule ensures Invoice compliance with CIUS-PL (Poland).

infoPL-02POLCIUS-PL (Poland)BLOCKED

Polish invoices should be prepared for KSeF

Polish invoices should be prepared for KSeF. This validation rule ensures Invoice compliance with CIUS-PL (Poland).

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