I have seen issues with brackets being treated as special charactersor something like that.
One thing to try is instead of putting every value in the map just create a value defined as <Any>
That acts as a wildcard. If you wanted to just fiond all Compaq models you could enter <Any>Compaq<Any>
However, I am not sure what you are trying to accomplish. If you want to identify systems with a value for model just query it with the Exists operator.
- Kurt