This issue is part of the course hierarchy project.

Subsections use a particular activity plugin to point to the course position. However, this introduced some problems in formats that do not use sections. The setting in single activity format shows subsection as a valid setting when it should not.

Steps to reproduce :

1. Login as admin and go to the courses page.
2. Select create a new course form the my course action menu
3. In the course creation format open the format settings
4. Set the format to "single activity format" and wait for the page to reload.
5. Now check the values in "Type of activity"
   1. Expected: subsection should not appear
   2. What happens: subsections appear. If you use it the course page is blank and the activity chooser is not working as expected.

Technical shaping

• Activities extending sectiondelegate class shouldn't be used in course formats without sections.