# F-LIB231

Source: https://xmlvalid.com/rules/F-LIB231

> Use either PerUnitAmount or Percent

- Level: error
- Rule sets: OIOUBL 2.1 Invoice rules (Denmark) 1.17.2, OIOUBL 2.1 Credit Note rules (Denmark) 1.17.2, OIOUBL 2.1 Reminder rules (Denmark) 1.17.2
- Test: `cbc:PerUnitAmount and cbc:Percent`

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