WC3 Editor : can't change Unit Attack Range

I can’t modify a unit’s attack range in the Trigger Editor, I tried with multiple index. “Unit - Set Unit Weapon Real Field”.

It says ua1m (Missileart) instead of ua1r (rangen1), maybe it can be changed if it’s the problem.

Maybe I did something wrong, but for now I think its the bug.

I think that the correct form to change the unit´s attack range is for “Edit Object” . Do you had try this method?