Query Widget

I have some flex maps I have created, sewer and water. When I made the query widgets for the sewer map, I made them on the type of pipe, i.e. steel, concrete, PVC, etc. When I made the water map, I tried the same queries. For some reason, the PVC pipe can't be queried. I either get an error, or it says there is no results to the query. I tried making another feature class, with a domain assigning PVC as "plastic". I set the query as Material LIKE 'P%', and I still get either the error or no results at all. Am I missing something? This worked beautifully in the sewer map. What am I missing?
Thanks,
Robin