Managers can only add Attributes, but not edit or delete attributes related to direct reporting employees (first degree reporting employees). Should a manager wish to edit or delete an attribute/review relating to a direct reporting employee, the manager's reporting manager has to be the one to make the changes.
This is to ensure accountability, so that personal biases and the "shifting of goalposts" can be eliminated in performance reviews between managers and direct reporting employees. Managers are allowed to edit or delete attributes for second degree reporting employees and below.
In the example below, should Jeslyn make a mistake and would like to edit one of her reviews for Colin's appraisal, she would need to get her reporting manager, Thomas to make the edits on the system using his account.