in Schedule Activity have hide MARK AS DONE button and button DONE & SCHEDULE NEXT should be available for user. if user press DONE & SCHEDULE NEXT then it should check 2 custom fields x_due_date and x_activity_type_id on this view, if both are filled then it will create Next Schedule Activity otherwise don't. how to restrict it through Odoo frontend Settings -> Technical. please help, i have reached at this point after getting some help.

note: i have created an Automated Action to Create Next Activity when a new Lead created. so the given solution should not be conflicted.

regards