Sal,
I have seen some quirky things with the labview sql toolkit. sql statments that work in Access somtimes won't work when pasted into the sql toolkit. Things that make these problems go away are changing (or adding) single quotes to double quotes, square brackets instead of parentheses, Using the words "PROCEDURE proc_name" (remove quotes, change proc_name to the actual name)in front of the sql statment(s).
I don't have much experience with passing parameters to / from stored procedures so I can't speak exactly about your problem, but maybe something above will help.
Jared