{

"checkout.due" :
    { "context_org" : "circ_lib",
      "filter"      :
            { "checkin_time"  : null,
              "-or"           :
                    [ { "stop_fines"  : ["MAXFINES", "LONGOVERDUE"] },
                      { "stop_fines"  : null }
                    ]
            }
    }

}