Answer:
- Go to Main > Master Data Management > Others > Designation Set Up (M > O > D)
- Press Alt + L.
- Select Designation or create new.
- Set “Change Action Control = Yes”
- Set “Delete Activity and Audit Log = No”

- Save.
- Save the designation.
Now tag the designation with the user to restrict him/her from deleting anything from Audit Report and Activity Report.
For more details please visit: http://www.rancelab.com/help/fr6_designation_setup.htm