FIX: You cannot run some SQL Server 2005 Integration Services packages in Business Intelligence Development Studio if you also run the same packages by using the Dtexec.exe utility
The following pages were recently modified.
Source: Knowledge Base
Product: Microsoft SQL Server 2005 Enterprise Edition & SQL Server 2005 Standard Edition
Notification Contents: New and Major Modifications
FIX: You cannot run some SQL Server 2005 Integration Services packages in Business Intelligence Development Studio if you also run the same packages by using the Dtexec.exe utility
http://support.microsoft.com/kb/942665/en-US