Choosing the independant variables to export

Hello everyone.

When exporting the model in the picture, I want the variables to be:

s_P2(t), theta_R2(t) and theta_R3(t), as in the help example.

http://www.maplesoft.com/support/help/MapleSim/view.aspx?path=MapleSim/Multibody/Kinematic_Exports

However, I obtain:

theta_R1(t), theta_R2(t) and theta_R3(t)

How can I choose the variables that I want?

Thanks for make learning easier!