Article ID: 2458470 - View products that this article applies to.
Consider the following scenario:
Ambiguous attribute flow from multi-value to single valued attribute.
To resolve this issue, apply this following hotfix package:
(http://support.microsoft.com/kb/2459257/ )Description of the SharePoint Server 2010 Cumulative Update Server Hotfix Package (MOSS server-package): December 31, 2010
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.