Edit History of a RecordEdit History of a RecordOnce a service request has reached a closed status, it is archived. To modify an archived service request, use the Edit History action on any tab of the Service Requests (SP) application. The system records all changes you save on a history record.
Note: You might need security authorization to perform this action.
In the Service Requests (SP) application, display the record for which you want to edit history.
From the Select Action menu, select Edit History Service Request.
Editable fields are no longer read-only. Edit the appropriate fields.
Click Save
Service Request 
to save your changes.