PL-01
Error Guide
🇵🇱 PL-01: Polish sellers should include NIP number in Poland
WarningMandatoryManual Fix
Polish sellers should include NIP number. This validation rule ensures Invoice compliance with CIUS-PL (Poland).
Quick Facts
Severity
Warning
Ruleset
CIUS-PL (Poland)
Mandate
B2B Mandatory
Fix Type
Manual
Why This Matters in Poland
Poland requires e-invoicing using KSeF XML format. This warning may cause processing delays in Poland. While not immediately rejected, it should be fixed for compliance.
Invoice Navigator covers 134 KSeF FA(2) rules for Poland. Auto-remediates 78% of top rejection errors.
How to Fix PL-01
Review your Invoice XML structure and correct the issue described by this rule. Check relevant cbc: and cac: elements per CIUS-PL (Poland).
Example: Before & After
Before (invalid)
<Invoice> <!-- Issue: Polish sellers should include NIP number --> </Invoice>
After (fixed)
<Invoice> <!-- Issue resolved per CIUS-PL (Poland) --> </Invoice>
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
Fix PL-01 automatically
Upload your invoice and let Invoice Navigator auto-remediate this error.