STEPS TO REPRODUCE
1. Launch iClone 6
2. Apply a random project
3. Go to Scene Manager, select "Camera" and click to "Show"
4. Launch Timeline, in the frame 1, link Camera to the character's head
5. Navigate to Modify > Linkage, launch "Link to Sub-Node" panel, then select "Position and Rotation", click "OK"
6. Pick Camera, right-click and select Link > Unlink
7. Move the Camera

ACTUAL RESULT
The rotation data of the camera cannot be cleared

EXPECTED RESULT
Camera linking and unlinking function can work properly, the rotation data of the camera can be cleared correctly