# F-INV001

Source: https://xmlvalid.com/rules/F-INV001

> Root element must be Invoice

- Level: error
- Rule sets: OIOUBL 2.1 Invoice rules (Denmark) 1.17.2
- Context: `/`
- Test: `local-name(*) = 'Invoice'`

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