`IS-R-003`

A rule of Peppol BIS Billing 3.0, published by OpenPeppol. Its text is not reproduced here. The API and the web validator return it in every finding.

Official rule text

Where the rule applies

Rule set	Document type	Severity
Peppol BIS Billing 3.0 (3.0-2026.5) OpenPeppol	Peppol BIS Billing 3.0 (UBL Invoice), Peppol BIS Billing 3.0 (UBL CreditNote)	fatal

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

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": "fatal",
  "ruleId": "IS-R-003",
  "message": "…",
  "xpath": "/…",
  "source": "schematron:peppol-bis@3.0-2026.5",
  "docUrl": "https://einvoice-api.eu/rules/is-r-003.html"
}

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Severity comes from the official rule set; this page is generated from the API's configuration. Not legal advice.