BPCUI0459W The selected subcomponents cannot be removed from the application because they cannot be moved up a level in the application hierarchy due to name conflicts with the existing applications or subcomponents at the higher level.

Explanation

When you remove a subcomponent from an application, the subcomponent is moved up to the same level as the parent application. If the subcomponent has the same name as an existing application or subcomponent at that higher level, it cannot be moved up and the subcomponent is not removed from the application.