Engine Classification
Financial or legal field · Modification blocked by policy
Reason: FatturaPA XML must conform to the official XSD schema from Agenzia delle Entrate. Schema violations indicate structural issues in how your ERP/invoicing system generates XML. Contact your software vendor or update your invoice generation template to match the current FatturaPA specification.
What is SDI-00400?
SDI-00400 is a fatal validation rule defined in the FatturaPA specification (ITA national rules).
When this rule fires, the invoice is rejected by Peppol access points and never reaches the buyer.
Why This Error Matters
SDI-00400 is a hard failure — the invoice must be corrected and re-sent before it can reach the recipient.
Validator Behavior
- ·Causes invoice rejection
- ·Rejected by SDI (Sistema di Interscambio)
- ·Error returned: SDI-00400
- ·Specification: FatturaPA
How to Fix It
Technical Reference
Common Causes
- ·Custom fields causing schema violation
- ·Invalid XML characters
- ·Wrong element order or nesting
Seeing this in production? The API handles SDI-00400 automatically. See the fix response →
Frequently Asked Questions
FatturaPA XML must conform exactly to the official XSD schema published by Agenzia delle Entrate. Any structural deviation causes rejection.
Validate the XML structure against the FatturaPA schema before submission. This error involves a protected field — Invoice Navigator flags it in your pipeline so your team can correct it at the source.
Yes, SDI-00400 is a critical error that will cause invoice rejection. It must be fixed before submission to ensure your invoice is accepted by the recipient's system.
SDI-00400 involves a financial or legal field that cannot be auto-modified by policy. Invoice Navigator detects and flags this error immediately, but the correction must be made manually in your ERP or invoicing software.
Related Content
Last updated: 3 March 2026
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This error involves a financial field that can't be auto-modified. We'll flag it with a clear diagnosis so you can fix it at the source.