Add Backflush Filter to Job Picklist

I’m trying to pass a filter to the job picklist such that the user can conditionally elect not to display material records for backflushed materials. Adding the backflush field to the RDD is not a problem, but finding a way to pass the report parameter has been problematic. In reviewing the xml generated, I noticed that only a subset of the report parameter table is getting passed into the xml. Not sure why—I’ve tried populating other parameter fields, and they are not getting passed. Has anyone found a way to accomplish this in 10?