I have never tried to manipulate the call in CR. I tell CR that I want to use a stored proc, it then prompts me for parameters, and then it sets up the call...all I need to do is change the text for the parameter screen....
so I'm confused as to what you are asking CR to do...
why are tell CR to pass something to it...since what you are passing is not a parameter (it doesn't vary, and there is no user input), why not just have the sp grab the value you want and remove the parameter?