# PEPPOL-T01-R030

Source: https://xmlvalid.com/rules/PEPPOL-T01-R030

> When TAX category code is "Standard rated" (S) the TAX rate SHALL be greater than zero.

- Level: error
- Rule sets: Peppol Order rules 3.7
- Context: `cac:TaxCategory | cac:ClassifiedTaxCategory`
- Test: `not(normalize-space(cbc:ID)='S') or (cbc:Percent) > 0`

Validate a document against these rules: https://xmlvalid.com/validate