Message in Chinese (Simplified) (中文(简体))
必须在根实体“<var>X</var>”的 KnownTypeAttribute 中声明派生实体类型“<var>Type Name</var>”。
Unlocalized message
The derived entity type '<var>Type Name</var>' must be declared in a KnownTypeAttribute on the root entity '<var>X</var>'.
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