Message in Chinese (Simplified) (中文(简体))
违反了引用完整性约束: 当依赖对象为 Unchanged 状态时，无法更改属于引用完整性约束一部分的主键属性，除非将该对象设置为关联的主对象。必须跟踪主对象，且不得将其标为删除。
Unlocalized message
A referential integrity constraint violation occurred: A primary key property that is a part of referential integrity constraint cannot be changed when the dependent object is Unchanged unless it is being set to the association's principal object. The principal object must be tracked and not marked for deletion.
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