This doesn't make sense to me -- I'm at war with Naples and Provence, with the latter the junior partner in a PU. Naples is 100% defeated, and I want to break their connection with Provence, but there seems to be no way to do this. If they were allies or a vassal, I could force an annul treaty. If Naples owned the territory I could force them to release Provence as an independent country. But because Provence is a junior partner in a PU, there seems to be nothing I can do?