It is not explicitly stating in the books what the results will by if a member of the Olympic Coven crossed the line as defined by the treaty. It could be theorised though that the treaty would become void and the wolves and vampires would be free to attack and kill each other.
Since the treaty has been formed, only one member of the Olympic Coven has crossed the line, Carlisle Cullen. He was invited however to treat Jacob for an injury he received during the fight between the Seattle Newborn Army in Eclipse.
In Breaking Dawn, the treaty was redrafted due to Jacob's imprinting of Renesmee, Bella's daughter, who is a Vampire-Human Hybrid. There is a law within a pack of wolves that no member can kill another members imprinted 'mate'. If they do, then that wolf is to be killed as retribution of the killing of another members soulmate.
It is unknown how the treaty changed due to the redraft.
In "Eragon," the Urgals break the treaty with the Varden by allying with Galbatorix, the antagonist of the story. They fight against Eragon and the Varden in battle.
In the Twilight series, the treaty between vampires and werewolves, the Quileute tribe, states that vampires are not allowed to bite humans on the Quileute reservation, and werewolves are not allowed to attack the Cullens or their allies unless the vampires' actions break the treaty. The treaty is meant to maintain peace between the two groups and prevent conflicts.
the treaty line
yes
1941
Yes, Germany broke the Treaty of Versailles by rearming and expanding its military in the 1930s, in violation of the treaty's restrictions.
-kristen-kristen
the treaty was that if cullens didn't bite a human the quiletes wouldn't expose what they really were.
3 times, but they were all done with permission from the wolves.
Treaty of Versailles was broken by Hitler and that began WW2.
why do you care twilight sucks
Done by the Treaty of Versailles.