Why are certain objects like Subject Area and Relationship omitted from the Complete Compare when trying to resolve differences?

Question: 

Why are certain objects like Subject Area and Relationship omitted from the Complete Compare when trying to resolve differences?

Answer: 

This issue occurs when the correct Option Set choices are not selected for Subject Area and Relationships. 1. In the Complete Compare Wizard, select the Type Selection menu to view the Option Set choices. Make sure to check the boxes: Relationship and Subject Area:

Note: Choosing the Relationship option brings in all properties belonging to the Relationship objects.

2. The Subject Area and Relationship objects should now be visible when the Compare button is selected (the same principle applies to any object chosen in the Type Selection menu):

Additional Information:

1. Select Objects and Properties By Type: https://erwin.com/bookshelf/public_html/2020R2/Content/User%20Guides/erwin%20Help/Select_Objects_and_Properties_By_Type.html