# F-CRN168

Source: https://xmlvalid.com/rules/F-CRN168

> Invalid ReferenceID. Must contain a value

- Level: error
- Rule sets: OIOUBL 2.1 Credit Note rules (Denmark) 1.17.2
- Context: `doc:CreditNote/cac:CreditNoteLine/cac:DiscrepancyResponse`
- Test: `normalize-space(cbc:ReferenceID) != ''`

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