# F-REM089

Source: https://xmlvalid.com/rules/F-REM089

> DebitNoteDocumentReference class must be excluded

- Level: error
- Rule sets: OIOUBL 2.1 Reminder rules (Denmark) 1.17.2
- Context: `doc:Reminder/cac:ReminderLine/cac:BillingReference`
- Test: `count(cac:DebitNoteDocumentReference) = 0`

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