Specifies whether a leaf system is active and applicable for modeling, drawing, and reporting operations. To exclude the leaf system from these operations, select No. In the hierarchy explorer, the lock icon is shown over the icon of the deactivated leaf system, and the detailed or light part associated with the leaf system is also deleted. In addition, because connections to deactivated leaf system are not valid, you must resolve such invalid connections in the To Do List. To change the leaf profile system back to the active state, select Yes; however, to have the detailed part, you must detail the leaf system explicitly. See Marine Structure Hierarchy in the Workspace Explorer for more information on leaf systems.