`SDI-00421`

2.2.2.6 <Imposta> … is not AliquotaIVA * ImponibileImporto / 100 = … (tolerance 0.01).

Official rule text

SDI 00421: 2.2.2.6 <Imposta> … is not AliquotaIVA * ImponibileImporto / 100 = … (tolerance 0.01).

Where the rule applies

Rule set	Document type	Severity
FatturaPA (XML schema, SDI controls) (1.2.3) Agenzia delle Entrate	FatturaPA 1.2.3 FPR12 (B2B), FatturaPA 1.2.3 FPA12 (public sector)	error

Fatal and error findings make the invoice invalid (valid: false); warnings and information do not.

Technical check

Syntax: FATTURAPA · FatturaPA (XML schema, SDI controls) (1.2.3)
Condition: exists($rate) and exists($base) and exists($tax) and abs($tax - f:round2($rate * $base div 100)) gt 0.01

Syntax: UBL · FatturaPA (XML schema, SDI controls) (1.2.3)
Condition: exists($rate) and exists($base) and exists($tax) and abs($tax - f:round2($rate * $base div 100)) gt 0.01

How the API reports this rule

Every finding of POST /v1/validate carries the rule id, severity, message, location (XPath) and rule set, and links this page (docUrl):

{
  "severity": "error",
  "ruleId": "SDI-00421",
  "message": "SDI 00421: 2.2.2.6 <Imposta> … is not AliquotaIVA * ImponibileImporto / 100 = … (tolerance 0.01).",
  "xpath": "/…",
  "source": "schematron:fatturapa@1.2.3",
  "docUrl": "https://einvoice-api.eu/rules/sdi-00421.html"
}

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Rule text and severity are taken unchanged from the official rule set; this page is generated from the API's configuration. Not legal advice.