Issue Summary

Inline creation of Sub-tasks is allowed Epic and other issue types above in the hierarchy

Steps to Reproduce

When we change the Issue type of a Standard Issue type which has Sub-tasks to Epic (Level 1), the Sub-tasks will be retained on the Epic, and this also enables the '+' option that allows new sub-tasks to be added inline:

• The behaviour is the same when standard issue types get converted to Issue types of Level 2, 3 etc. 
• And also when the sub-tasks are imported to Epic from a CSV file.

While the sub-tasks are moved to preserve the existing relationship between the Epic and the Subtasks, the option to create new sub-tasks need to be disabled.

Expected Results

New sub-tasks cannot be created under Epic or other issue types higher in the hierarchy.

Actual Results

New sub-tasks are allowed to be created inline.

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available