I've got the only two planets in it. Apart from that there's a structure which I can't occupy. But I still can't end the war until I occupy all of it. What do I have to do here?


Because you are at war with a federation maybe? Game thinks you want to vassalize all the empires, which you don’t have all occupied.
Make a claim on that system, settle status quo, and spit out a sector vassal.
Just claim that system then, and settle Status QuoBut I just wanted to take that system. Anyway they're all occupied (that empire).
But that’s the fun way to go about it!Just claim that system then, and settle Status Quo
You don’t need to fight Galactic War 2 over 1 system
Just claim that system then, and settle Status Quo
You don’t need to fight Galactic War 2 over 1 system
Ok, let’s start over…The problem is, then my main wargoal (to vassalise Gorf) would become impossible. They won't accept any peace unless I've taken all my claims.
Ok, let’s start over…
What is your goal in this war?
Does it have to be that tag? Or are you ok with a new tag being formed as your vassal?Vassalise one of their nations and just take a bunch of land (and space and sea and air) apart from that (they attacked me)
Does it have to be that tag? Or are you ok with a new tag being formed as your vassal?
Actually, the weird thing is, at some point during the war the federation completely split up, but for some reason they are still fighting together.This is where "War Goal: Dissolve Federation" would come in really handy.
No, you don’t have to conquer all their worlds.Well, I mean I could, but I would have to conquer every one of their worlds, and the war's already been going on for 35 years soo...