Hello Chandra,
The names of the objects changed by a user are entered in an object list. This object list is
assigned to a task belonging to a user or project member.
One or more tasks belonging to various users are assigned uniquely to a higher-level change
request, which in turn represents a development project.
For more details go through the following link
http://help.sap.com/printdocu/core/print46c/en/data/pdf/BCCTSORG/BCCTSORG.pdf