errorITAFatturaPA

SDI-00400:XML schema validation failure

FatturaPA XML must conform exactly to the official XSD schema published by Agenzia delle Entrate. Any structural deviation causes rejection.

Fix this in your source system

MANUAL

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.

See the step-by-step instructions below to fix this error manually.

How to Fix It

Common Causes

  • Custom fields causing schema violation
  • Invalid XML characters
  • Wrong element order or nesting

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. You can also use Invoice Navigator's automatic Fixer tool to correct this instantly.
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.
Many instances of SDI-00400 can be automatically corrected using Invoice Navigator's Fixer tool. Upload your invoice and the tool will identify and fix common issues, including xml schema validation failure.

Last updated: 19 January 2026

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