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Softimage Xsi: about rotate 2d and 3d bones

Posted: March 23, 2007
the 3.0 book says:

With 2D and 3D chains, you can rotate a bone in X. However, you cannot do

this with a 2D chain that is solved in inverse kinematics (its effector is

translated). The solving of the chain in IK overrides any animation that has

been done on a bones X or Y rotation. To solve the problem of being able to

rotate the IK bone in X, you can set its Roll value.

i cannot do this with a 2D chain ?

but i find i can rotate any bones in 2d chain why?