Normally when you do a production search, you are returning points on a map (or table) that represent wells that match the search criterion. For production, which is often reported by lease, sometimes you do not want every well in the lease but rather just one representative well (since all wells in the same lease will have the same production).
This option forces the search to just return one well for each lease. The particular well is chosen randomly if there is more then one well in the lease.
See Market View Search for more information.