Why? Because reference data or static data that used to populate drop-down options on the UI, enabling autoRefresh() return the results from cache. The underline attributes worked the same as caching in flow services - when the input data changed, only then that the service will invoke the web service connector for the updated result set.
The effect is streamlining the user experience and making navigation between screens alot more responsive.
This property is available in webMethods Designer, My webMethods perspective, under the Bindings tab.
