This read-create boolean marks the connection's associated preferred route, set via cwaChanPrefRouteId, as a directed route, meaning that route is the only permitted path for the connection. An admin enables this when a connection must strictly use a specific path and should not fail over to an alternate route if the preferred one becomes unavailable, unlike a normal preferred-but-not-exclusive route. For example, for regulatory or contractual reasons requiring traffic to traverse only a specific physical path, the admin would set this to true alongside a preferred route ID so the switch never substitutes another route if that path goes down.