BPCUI0458W The deparments listOfDepartments cannot be deleted because they contain subdepartments or applications subdepartment, which cannot be moved up a level in the departments hierarchy due to name conflicts with departments in that higher level.

Explanation

When you delete a department, the subdepartments and applications that belong to that department are not automatically deleted unless you specify the Remove subdepartments and applications option. They are moved to the next higher level in the department hierarchy. If those subdepartments and applications have the same name as a department or an application in the higher level, they cannot be moved up, and the parent department of those subdepartments and applications cannot be deleted.