There's common requirement for any client that Help Desk Team/Administrators should be able to search and track all the requests and should be able to see the approval details.
We can give "Search Request" permissions by assigning Admin Roles but there's no Admin Role which gives permissions to view Approval Details. This is not a supported feature today.
There are some OOTB Roles in OIM which get created at the time on installation. There's one role called "Administrators". This role has the permissions to view the Approval Details but you can assign this role to anyone. It's restricted to only one "weblogic". Assign this role to any user and he would be able to view Approval Details.