OIM Approval Application form read-only based on the approval level

Hi All,

We have a requirement in OIM Approver Page for Provision application that is of 3 levels and 3rd level approver should not have option to update the form values. but level 1 and level 2 should have option to update the form values. each level approval is assigned based on the Role. let say Role1 in level1 and so. now the problem is Level 3 user should not approve who is with Role3. we had added el expression to make the form field read only for Role3 but the problem now is we have Role 2 and