Can you please re-share the Bug Link
Metalink shows that requested link is unavailable.
Kindly copy paste the full URL and post it as I tried searching using BugID also but the same is not visible.
It's not really a link. That was a comment taken straight from the form (opened in Forms Builder). I was unable to pull anything up referencing that bug number as well.
Upon your post I tried looking on Metalink and was unable to find any such document.
Can't you please try enabling the profile option on your test environment and verify it ?
I believe the system will restrict the user to update his own assignment rates, but third person like "HR Executive" can make changes for other people.
Kindly do a practical test case for the same and confirm.