# F-INV034

Source: https://xmlvalid.com/rules/F-INV034

> One PartyLegalEntity class must be present

- Level: error
- Rule sets: OIOUBL 2.1 Invoice rules (Denmark) 1.17.2
- Context: `doc:Invoice/cac:AccountingSupplierParty/cac:Party`
- Test: `count(cac:PartyLegalEntity) = 1`

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