你这里要理解ug主模型的概念：ug的属性是从主模型传递到二维，而不是相反。另外，ug的属性分为三种类型:文件本身属性，object属性，引用集属性。如果三类属性集有重名的属性，则优先级是本身属性，引用集属性，object属性。
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另外在作maping格式文件书写时，注意有一个选项是控制属性的传递方向：是双向还是ug-->iman or iman--->ug作者: amd 时间: 2006-5-10 08:21
造成你描述现象的还有一个原因是：
请看iman help中对于映射限制的描述：Teamcenter Engineering restricts the attributes that are potentially modifiable in NX and the mapping file is unable to override this restriction.
A modifiable attribute must be one of the following:
A property of a dataset
A property of any form that is a named reference of the specific dataset, and no other dataset