This function locks a cluster, i.e. no courses will be removed from the cluster during course optimisation . However, you can allow course optimisation to add courses to a locked cluster .
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Fixed (locked) clusters are indicated a * next to the cluster number and by a grey background.

Note: Fixed (locked) clusters
Fixed clusters will also normally remain unchanged during timetable optimisation, i.e. all courses in a fixed cluster will also be scheduled at the same time. Please also refer to the application notes in section 'Course scheduling and clusters in timetable scheduling'.