I've created an InfoPath form that consumes a query webservice using rules: on click of a button the form populates the webservice data source with the query parameters, queries using the data source, then populates a field in the main data source with the results. The problem that I'm encountering is that on first click, this works fine. However, on changing the input parameters and clicking the query button again, the returned value does not change until clicking a subsequent time. What am I missing?