One thing that comes to mind is that one of the attribute names might contain a invisible invalid character such as a tab, newline or carriage return. Can you check whether that is the case. You might need some sort of macro to get rid of these invisible
characters. If you can send me the excel sheet in question (no need to leave the data in since the problem seems to be with the attribute names) I will take a look. You can reach me at: arunjeet.singh at live.com.
Arunjeet Singh (Microsoft SQL Server Master Data Services)