This read-only object reports the secondary state of an E-Line Flow, a supplementary status qualifier layered on top of its primary administrative and operational states to give finer detail about the flow's condition. An administrator reads this to understand more precisely why a flow might be degraded or blocked even when its main operational state alone does not explain the situation. For example, a secondary state value indicating a fault condition on the flow would prompt an operator to investigate further rather than assume the flow is fully healthy just because it is administratively up.