EL expession for Hide add button on Manage personal contribution

We have ICP plan setup as personal contribution , all employees are eligible for this plan but goes to Line manager approval upon request. Line Manager can edit the plan to change the values of plan which employee has requested from approval notification link by clicking on edit icon on notification. Line manager should not be able to see add button when going through notification link into employees contribution screen. EL expression to hide add button based on role is hiding button even when line manager want to add plan for himself from my personal contributions.

Looking for EL expression to hide button only when Line manager is trying to change values for other employees when going through notification link.