When in configuration management, trying to add a 'New configuration item' to the Configuration Item folder results in:
'Null value set for attribute Guid of class type Config.configitem. This attribute is mandatory and must contain a non-null value'
This is a problem, and the 'New configuration Item' action should not be available at the top level, it only works when adding a new configuration item to the folders below the top level.
To add new folders below the top level configuration item folder, you need to go to Object Designer and add new Business Objects to the Configuration Item object, these will now appear in the tree in Configuration Managent.