End Condition Exception Not Following Horizontal Feature Constraint

I am trying to apply an end condition exception to a template that has a right outside edge of pavement that is controlled by a horizontal feature constraint so the outside edge of pavement is able to...
Corridor objects - Point control , key station , parametric constraints

I am not able to add any new point controls , constraints or as any corridor object in my corridor. The only way i am able to add any object is by copy pasting an already created one and modifying it....