Product Flow Port constraint. A port on the other end of an internal connection. True ("true" or "1") indicates that this is a recomended setting rather than an actual setting. False ("false" or "0") or not given indicates otherwise. The date and time that the constraint was activated. The date and time that the constraint was terminated. The flow rate across the ports. This defines a setpoint such that something (e.g., the choke size) should vary in order to achieve this rate. The differential pressure between the ports. This defines a setpoint such that something (e.g., the choke size) should vary in order to achieve this difference. The relative size of the choke restriction between the ports. This characterizes the overall unit with respect to the flow restriction between the ports. The restriction might be implemented using a valve or an actual choke. For block values, this should either be either 100 percent (closed) or zero percent (open). The unique identifier of the recurring element.