I'm trying to understand DOP Constraints.

I don't understand why Object Space Constraint doesn't work than i expected.

If i constraint a wheel in World Space Position with option Constrained to Line, it works like i expected.
BUT when this constraint is an Object Space Position with the same option, the constraint stay at the position, option Constrained to Line seems not to be applied.

See attached file and play with the red switch.

Thanks for help