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Working with the Main Screen for Worklist
Assignment 
On the main screen for worklist assignment, you can view information about all users and organizational units that are assigned to worklists. If you are in processing mode, you can also change the assignments.
For information about the actions that you can execute on the main screen, see Displaying Worklist Assignment and Changing Worklist Assignment.
The following screen areas are available on the main screen for worklist assignment:

The worklist area is in the left screen area, where you can display the users and organizational units on the first level according to software component, and on the second level according to worklist. Users have the prefix US, organizational units have the prefix O.
The user area is the top right area of the screen and contains the user names sorted by the initial letter of the user name.
The organizational structure area is in the right lower-hand screen area, where you can display organizational units according to software component, and if any exist, you can display the assigned positions with the assigned users. Organizational units have the prefix O, positions have the prefix S. As positions are connected to organizational units, you cannot assign positions directly. They must be assigned indirectly using the organizational units.

The higher-level organizational unit is the root organizational unit, which you specified in the Customizing for the Postprocessing Office under Worklist ® Define Root Organizational Unit.