How to allow ITIL users to add delegates only to their own profile, not others.

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I want to give ITIL users access to add delegate only to their own profile. Is there a trick to compare logged in user and the profile (s)he is going to update. So if both user ids are not matching, we can restrict this operation.

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thanks all for the help. I'll try the method later. For the time being, I wrote a BR to restrict users to change/add other's delegate.