Message in Chinese (Simplified) (中文(简体))

无法验证 EntitySet <var>X</var> 的映射。请核实映射约束可能有存储端约束。不可以为 null 的列的映射中有 'IsNull=True' 条件就是不能存在的约束的一个示例。

Unlocalized message

Could not validate mapping for EntitySet <var>X</var>. Check that the mapping constraints are possible in the presence of store side constraints. Having an 'IsNull=True' condition in the mapping for a non-nullable column is an example of an impossible constraint.

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