The managed role is typed with the generic business object and points to the key attribute that will hold the relationship instance id at run time.
托管角色采用通用业务对象，指向将在运行时保存关系实例ID的键属性。
Never try to save a Manager Instance on a non - transient field of a Managed Object.
绝对不要尝试在一个管理对象的非瞬时域上保存一个管理器实例。
Never try to save a Manager Instance on a non - transient field of a Managed Object.
绝对不要尝试在一个管理对象的非瞬时域上保存一个管理器实例。
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