Sorry, I should really explain....
When you reroute a feature, you are changing the basic references that the part was built upon.
You will be asked to choose a new ref or use the same ref for each plane/axis/edge that you use to develop the model in the first place. Remember that once you change the plane that you sketched the orig model on, you will also have to change the plane that the sketch refs to make the sketch align perpendicular to the screen.
Hope that makes sense
Kevin Hammond
Mechanical Design Engineer
Derbyshire, UK