# F-INV138

Source: https://xmlvalid.com/rules/F-INV138

> One or more TaxTotal classes must be present

- Level: error
- Rule sets: OIOUBL 2.1 Invoice rules (Denmark) 1.17.2
- Context: `doc:Invoice/cac:InvoiceLine`
- Test: `count(cac:TaxTotal) != 0`

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