Course completion in more detail

11. Unenrolment

The final option is unenrolment.  This is only really useful for pre-requisite courses.

When a student is enrolled from the course, they will be marked as complete.  However, if you do this in a main course, the student will not longer be listed in the course completion report!

Where is it enabled, the prerequisite course will be marked as complete in the main courses course completion status.

I have yet to find a use of this so it may have different functions from those I have outlined above.