Message in Chinese (Simplified) (中文(简体))
试图删除 <var>X</var> 和 <var>Y</var> 之间的关系。但是，关系的其中一个外键 (<var>Z</var>) 无法设置为 null。
Unlocalized message
An attempt was made to remove a relationship between a <var>X</var> and a <var>Y</var>. However, one of the relationship's foreign keys (<var>Z</var>) cannot be set to null.
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