How To Restrict The Record Edit/Modification Access Only To Record Owner and System Admin

If you have a requirement like the record can only be modified either by the owner of the record or the system administration .Other than this if any user tried to modify the record we shouldn't allow them to modify it.

Please use the validation rule to achieve this with below conditions check.

AND( 
     NOT(ISNEW()),
     NOT(OR($Profile.Name == 'System Administrator', $User.Id == OwnerId))
   )

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Hope this helps you..Enjoy..!