Body CS Problem

Hi,

I am simulating a system with a few rigid bodies.
I connected a body sensor to one of the bodies and selected "with
respect to the coordinate system" selection as "Local (Body CS).
Since my body is a rigid body; the coordinates of the port that my
sensor is connected must be constant. However when the simulation is
completed; it turns out to be changing. Moreover, the components of the
measured position vector is w.r.t. World Coordinates.
I decided to duplicate the port and connect another sensor with
"Absolute(World)" selected and run the simulation again. Then compared
the measured positions. They turned out to be different.

I have no idea what is happening.

Must not the coordinates of the port w.r.t. body CS be constant?

.

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