Save editing to create vassals and personal unions?

Save editing to create vassals and personal unions?

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Obligatory "I don't know if this is the right place to post this".

The title says it all, really. I'm trying to edit a save to put Cornwall in a personal union under Wales, but it doesn't seem to be working. Putting the "union=[monarch ID]" command in history just doesn't do anything.

I also can't find any line in the save game that suggests on country is a vassal of another. Burgundy has Brittany as a vassal, but after combing both countries entries in the save file, I can't find anything that would suggest the two are connected.

I also used the EU3 Save Editor and the Clausewitz Scenario Editor, but neither of them seem to have the tools to do it either.

Does anyone know how to edit a save file to make create vassals and personal unions? And if it can't be done, how does the game know what countries are vassals of others?