We had the issues that we could not create a customized entity.
After research we found out that this issue has been fixed within rollout 3.
http://support.microsoft.com/kb/936204
Unfortunatly we now facing issues installing the rollout.
How can I check detailed issue information?
Currently I just get the information that the database update failed and that I should connect the customer support centre. :-(
Thanks for the help
Sascha