Min and max angle - peg rotation

hi there.
im rigging a character where i want the hand - connected to the forearm to be able to rotate but on to some degree of free move.
when i go to layer properties on the peg layer i see advanced tab where i have angle limit values. its seem pretty straight forward, i put the angles but for some reason the program still doesnt limit the rotation angle. im using animate pro 2. maybe im doing something wrong?
thanx in advance