No two choices should have the same ID
列表从现有网站栏加字段时报“No two choices should have the same ID ”错误，从网上查找原因是网站栏字段ID重复了。下载检查重复ID的工具检查，没有发现重复ID字段。怎么个搞法
你是不是已经添加过了？
可能是你加的列表含自定义列或content type，这些列和content type开始定义的时候有internal name 和Guid，这些internal name 和Guid也是不能重复的。
下面是参考
You probably get this error when you try to add an existing site column to a site content type.
The reason is that two site columns have the same internal name.毕业论文
1. Check if the same error occurs at the root site when adding an existing site column to a site content type.
2. Once you've determined at which level the site column conflict is occurring, crack open your handy-dandy Sharepoint Manager 2007 (3. Navigate to the fields (site columns) defined for that site and you'll probably see an additional field that doesn't show via the normal site columns page (_layouts/mngfield.aspx). This field is your problem field because its internal name matches the internal name of an inherited field.
4. Check that this field is not used in any site content types or lists. You may have to remove it from them first.
可能是你加的列表含自定义列或content type，这些列和content type开始定义的时候有internal name 和Guid，这些internal name 和Guid也是不能重复的。
你的网站里面上有定义列或content type吗？
还有看看SharePoint的错误日志（C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\LOGS）里面可能有具体哪个字段（列）名重复的信息。