Calendars
A calendar includes start date, end date, close date, and frequencies. Calendars are assigned to Organizational Units in the Organizational Unit dialog box. See Managing Calendars.
Each period has a base calendar row added to the table by default, and this row has a locked icon appearing in the locked column.
The locked icon indicates that the row cannot be deleted.
The period can't be saved unless the Administrator selects the Calendar start, end, and close dates. The Administrator must select at least one frequency.