Quote - I think it will only add trans key frames to the goal actor. For the legs these would generally be the feet, for the arms the hands.

What is your IK's goal?

hi there sir,  however after several attempt i found out the keyframes trans xyz issue was perhaps just a glitch, now it works normally. but regardless of the previous issue, the problem still persist. my custom ik body part alwaz stay in place whenever an animated pose is applied.i've made a video to state my procedure n problem clearly. i wonder if i did  correctly...

http://www.youtube.com/watch?v=32Y_axp6uH8