What's the meaning of deal breaker ?

China
August 8, 2011 1:29am CST
It's a deal breaker for LP not to stand behind its equipment and this project. On the base of new demands you now suddenly speak of a deal breaker because of the fact that we do not want to return to the beginning and start all over.Everything comes to an end,also willingness of giving in.We regret this,as you say,a deal breaker,but better safe than to say sorry! Dear mylotters, I received two emails this morning,but I'm not sure about the meaning of"deal breaker" herein,do they mean to stop the business or just need more discussion?
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