I'm sorry, Mr. Dendooven, but I don't know that it does. I actually think that was quite grey.
Essentially, what I'm walking away with is that it's really up to the administrative body to determine whether a case will be heard. It's really up to them. They're using their own made-up criteria to determine which cases fit this definition of “national significance”.
You used the term in your definition. You said that national significance means something of “national importance.” Is there a list? Is there a checklist they can go through? Are there specific criteria they're looking at in order to determine if something is, in fact, of national significance, or is that just up to the administrative body to determine on their own?