Depending on what version of Pro Tools you have, usually you establish your sample rate when you start a new session. I have 7.4.2 and that is where you determine the sample rate, I just determine what rate I want and choose it.
is it cos the digi 002 control panel/preferences is set to FIXED? Like, most audio in/out devices have a control applet which also comes with some sort of mixer etc, and usualy that control-panel has an option that it can have the sample rate FIXED or programe dependant, where the programe sets the rate. did u try that?