
I have build a PO app where when a someone tries to reassign a PO to other approver it should display a gallery a approver to choose from so that user can select one from the list. I want to restrict users from selecting an approver who was already selected either in 1st level and also restrict users from selecting the same approver at same level twice.
Like in the above example since Sanbox has approved this PO at level 1 his name should have been greyed out, but here only the one who was selected before at level 2 is greyed out.
Ideally it should grey out Sandbox user and GNFR user as well.
Will add other piece of information if required.