Procedure
You can change tasks when you want to edit a task’s object abbreviation, or object name. Abbreviations and names are maintained in the Object infotype (1000).

You cannot change the validity period assigned to a task using the Change function. For this, you must use the Delimit function. To change the validity period of several tasks at the same time, use the report RHGRENZ0 (Delimit objects).
The Task Catalog screen appears.
The Task Catalog screen appears, displaying the selected tasks.
The Maintain Task screen appears.
The system inserts this information according to your selection in the task catalog.
The Object Infotype screen appears.
The Maintain Task screen appears.