A point for BracketByPlane is not related to a PlateSystem or any other object.
A point found on the relationship used for defining a BracketByPlane PlateSystem is not related to a PlateSystem. In this case, the point is not related to any other objects other than the one that was supposed to be a PlateSystem. Because the point is not providing any expected information, you should delete the point.
What You Should Do
Ask your database administrator to back up the model.
Supply all information possible that may have led to this situation, and submit this information along with the backup to Smart 3D Support.
Delete the object using one of the following methods:
Select the object in the Workspace Explorer, and delete it.
Run the Clean Database custom command to delete the object.