I'm not really sure what you're trying to ask here. Why wouldn't they be called up to the senior national team if they're good enoguh?
If I recall correctly without removing the fake.inc or something like that file in one of the folders Germany have a fake national team and are unmanageable, which as far as I know does lead to players not being called up for internationals. I think the clause about international apps was possible before, meaning you could offer them money on internation appearances that you would never have to pay, I dunno if it still works though, have never tried it myself