How do I fix SDI-00400?

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.

Is SDI-00400 a critical error?

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.

Can SDI-00400 be automatically fixed?

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.

Error codes · FatturaPA · Italy

SDI-00400Partly

XML schema validation failure

This is the rejection, word for word: „[SDI-00400] FatturaPA XML must conform exactly to the official XSD schema published by Agenzia delle Entrate. Any structural deviation causes rejection.“

What to have readyThe correct figures from your bookkeeping; we show you which field is affected.

What we doValidate the XML structure against the FatturaPA schema before submission.

Choose the rejected invoiceor drop it here

XRechnung XML or ZUGFeRD PDF. Checking is free · corrected file €1.90 · the first every 30 days is free · no sign-up.

What the finding looks likeExample

FindingNeeds your check · SDI-00400

From youThe correct figures

ThenChecked again

ProofSHA-256 and /verify link after the check