Exactly, it gets automatically void, not "sorry we won't respect that part". Thus the ECJ is in its very right to call that country in breakage of the treaty an

Exactly, it gets automatically void, not "sorry we won't respect that part". Thus the ECJ is in its very right to call that country in breakage of the treaty and apply whatever sanctions finds adequate, and that country has no stand to say "yes but". Because one cannot have their cake and eat it.