IT-01:Italian sellers should include Codice Fiscale or Partita IVA
Fix: Review your Invoice XML structure and correct the issue described by this rule. Check relevant cbc: and cac: elements per CIUS-IT (Italy).
Italian sellers should include Codice Fiscale or Partita IVA. This validation rule ensures Invoice compliance with CIUS-IT (Italy).
Engine Classification
Financial or legal field · Modification blocked by policy
What is IT-01?
IT-01 is a warning validation rule defined in the CIUS-IT (Italy) specification (ITA 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
Italian e-invoicing regulations require this for legal compliance. Invoices missing this information may be rejected by Italian government portals and business partners.
IT-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
- ·Rejected by SDI (Sistema di Interscambio)
- ·Error returned: IT-01
- ·Specification: CIUS-IT (Italy)
How to Fix It
Identify the issue in your invoice
Italian sellers should include Codice Fiscale or Partita IVA. This validation rule ensures Invoice compliance with CIUS-IT (Italy).
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-IT (Italy).
Re-export and validate
Generate a new invoice export from your accounting system and re-validate to confirm IT-01 is resolved.
Before / After
<Invoice> <!-- Issue: Italian sellers should include Codice Fiscale or Partita IVA --> </Invoice>
<Invoice> <!-- Issue resolved per CIUS-IT (Italy) --> </Invoice>
Technical Reference
Seeing this in production? The API handles IT-01 automatically. See the fix response →
Frequently Asked Questions
Italian sellers should include Codice Fiscale or Partita IVA. This validation rule ensures Invoice compliance with CIUS-IT (Italy).
Review your Invoice XML structure and correct the issue described by this rule. Check relevant cbc: and cac: elements per CIUS-IT (Italy). You can also use Invoice Navigator's compliance engine to correct this automatically in your pipeline.
IT-01 is a warning that may not always cause rejection, but indicates a compliance issue.
Many instances of IT-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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