Hi everyone!
I made nexts steps to achieve the goal.
create 3 types of screens:

And remove field "due date" from Edit and View screens. Thats cool and now noone can change date after issue created.
The next step is allow to edit date for Administrator or ProjectLead.
I've create new screen with date field only and edit workflow like this:

And setup condition:

But I cant edit due date as Administrator anyway.
Could you pls suggest to me whats wrong?
Thanks a lot!