Problem
You have accidentally stopped planning for a class template and want to restore it.
Possible cause
Stop planning is a permanent action. The template cannot be restored from the Class Template List. However, classes that were already created from the template before it was deleted will still exist in the calendar.
Solution
Create a new class template with the same settings as the deleted one.
Check whether the class instances that were already created are still available in the calendar.
If the problem persists, contact support and include details about:
The template name and settings.
When the deletion took place.