# F-REM087

Source: https://xmlvalid.com/rules/F-REM087

> No more than one ReminderPeriod class may be present

- Level: error
- Rule sets: OIOUBL 2.1 Reminder rules (Denmark) 1.17.2
- Context: `doc:Reminder/cac:ReminderLine`
- Test: `count(cac:ReminderPeriod) > 1`

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