• Setting the {incomplete, disjoint} constraint back to the default setting of {incomplete, overlapping} will result in the removal of the generalization set, which has the same meaning.
• Starting from MagicDraw 18.3, the Concept Modeling menu is disabled when you right-click a tree or a generalization set on a diagram because the menu options for creating a generalization set have been moved outside the Concept Modeling menu (see the figure below).

The Concept Modeling menu is disabled in MagicDraw.

• Starting from MagicDraw 18.3, the Concept Modeling menu options: Make subclasses complete and Make subclasses disjoint have been replaced with Subclasses Complete and Subclasses Disjoint respectively (see the following figure).

The Subclasses Complete and Subclasses Disjoint menu options.

The following describes how the subclass menu options work:

• When you make subclasses complete, there is a check mark before Subclasses Complete. If it is not complete, there is no check mark before the menu item.
• When you make subclasses disjoint, there is a check mark before Subclasses Disjoint. If it is not disjoint, there is no check mark before the menu item.