On P. 157 of the manual it says "Note that a "Full War" means peace other than by event or total victory is almost impossible (e.g., American Civil War, Taiping rebellion, or Third Carlist War). We must be at different editions of the manual. I searched and my manual doesn't use the term "Full War"...

What is a "full" war?

Did you ever get a resolution? I'm having the same problem--just started a couple of turns ago. My war score against China is 1219, according to the cross thunderbolts button for "number of nations at war with".