Gets or sets the Coordinate System.
Examples
The following sets Global Coordinate System from the Tree as the Coordinate System
criterion = Model.CoordinateSystems.Children[0]
criterion.CoordinateSystem = global_coordinate_system
Create a CenterOfGravityCoordinateSystem object to assign the property to the Criterion Coordinate System option (possible only for Moment of Inertia Base Result).
coordinate_system = CenterOfGravityCoordinateSystem()
criterion = Tree.FirstActiveObject
criterion.CoordinateSystem = coordinate_system