Deletions record the entire state of the DataObject before it was deleted.
对于删除操作，将记录删除前数据对象的全部状态。
Deleted elements are allowed only when the state manager is already tracking the relationship instance.
仅当状态管理器正在跟踪关系实例时，才允许已删除的元素。
Deleted elements are allowed only when the state manager is already tracking the relationship instance.
仅当状态管理器正在跟踪关系实例时，才允许已删除的元素。
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