PL-01:Polish sellers should include NIP number
Fix: Review your Invoice XML structure and correct the issue described by this rule. Check relevant cbc: and cac: elements per CIUS-PL (Poland).
Polish sellers should include NIP number. This validation rule ensures Invoice compliance with CIUS-PL (Poland).
Engine Classification
Financial or legal field · Modification blocked by policy
What is PL-01?
PL-01 is a warning validation rule defined in the CIUS-PL (Poland) specification (POL national rules).
The invoice may pass transmission, but this non-compliance can cause problems during tax audits or buyer-side processing.
Why This Error Matters
Polish e-invoicing regulations require this for legal compliance. Invoices missing this information may be rejected by Polish government portals and business partners.
PL-01 is a soft failure that can cause issues at the receiving end — tax audits, ERP processing, or VAT reconciliation mismatches.
Validator Behavior
- ·Generates validation warning
- ·Error returned: PL-01
- ·Specification: CIUS-PL (Poland)
How to Fix It
Identify the issue in your invoice
Polish sellers should include NIP number. This validation rule ensures Invoice compliance with CIUS-PL (Poland).
Correct this in your invoicing software
Review your Invoice XML structure and correct the issue described by this rule. Check relevant cbc: and cac: elements per CIUS-PL (Poland).
Re-export and validate
Generate a new invoice export from your accounting system and re-validate to confirm PL-01 is resolved.
Before / After
<Invoice> <!-- Issue: Polish sellers should include NIP number --> </Invoice>
<Invoice> <!-- Issue resolved per CIUS-PL (Poland) --> </Invoice>
Technical Reference
Seeing this in production? The API handles PL-01 automatically. See the fix response →
Frequently Asked Questions
Polish sellers should include NIP number. This validation rule ensures Invoice compliance with CIUS-PL (Poland).
Review your Invoice XML structure and correct the issue described by this rule. Check relevant cbc: and cac: elements per CIUS-PL (Poland). You can also use Invoice Navigator's compliance engine to correct this automatically in your pipeline.
PL-01 is a warning that may not always cause rejection, but indicates a compliance issue.
Many instances of PL-01 can be automatically corrected using Invoice Navigator's compliance engine. The fix is applied in your pipeline with full audit evidence.
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Last updated: 14 April 2026
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