We want to restrict our users to do any change in automatically free goods detected due to promotions.
if we have promotion of 1 carton on purchase of 10 cartons.
when user create order with 10 cartons two lines are comming.
one is standard 10 carton and second one is with 1 carton free good.
here user can change 1 carton to 5 carton but we want to restric user to do this change.
How can we achive this task.