Users prefer using "lightweight" feature in solidworks while dealing with huge assemblies and parts for performance gains.
With the setting above, next time the user tries a "smarteam save" on a lightweight part, a message window will pop up forcing the user to resolve the lightweight components before the save operation is performed. This would prevent the ! from showing up.
LIKE MENTIONED ABOVE, SMARTEAM SAVES THE PARTS EVEN THOUGH THEY ARE LIGHTWEIGHT. IT IS MORE OF A GRAPHICAL ISSUE WHEREBY USERS SEE ! INSTEAD OF THE PARTS.