# F-CRN082

Source: https://xmlvalid.com/rules/F-CRN082

> One Item class must be present when CreditNoteLine/BillingReference is not specified

- Level: error
- Rule sets: OIOUBL 2.1 Credit Note rules (Denmark) 1.17.2
- Context: `doc:CreditNote/cac:CreditNoteLine`
- Test: `not(count(cac:Item)) and not(count(cac:BillingReference))`

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