Then they are setting up a constitutional challenge with the ECJ, just like Poland. They were on the brink of it recently, when it got hushed it 'because Poland was doing it', but this kind of thing will highlight the fact that Germany doesn't accept ECJ Supremacy either. Interestingly enough, they may back off just enough so that the Germany-ECJ '40 year dispute' doesn't get inflamed, hoping that maybe after a few more decades it will just 'go away' with a German Judiciary, Parliament and Population that just accept the ECJ Supremacy, even though it doesn't actually say that in any treaty.