# PEPPOL-T01-R029

Source: https://xmlvalid.com/rules/PEPPOL-T01-R029

> Each Tax Category SHALL have a TAX category rate, except if the order is not subject to TAX.

- Level: error
- Rule sets: Peppol Order rules 3.7
- Context: `cac:TaxCategory | cac:ClassifiedTaxCategory`
- Test: `cbc:Percent or (normalize-space(cbc:ID)='O')`

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