This error occurs when an entity type exists in multiple entity sets.

当某个实体类型存在于多个实体集中时,会发生此错误.

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These helping entity sets are easily recognized because they are reached by a - diamond - one relationship from W.

这些辅助实体集是很容易识别的,因为它们通过 双 菱形表示的“多对一”的联系与W相联.

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For relationship involving two entity sets, there can be relationships like one - to - oneone - to - many, many - to - one and many - to - many.

对于涉及两个实体集合的关系, 可能存在像一对一、一对多 、 多对一和多对多那样的关系.

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