I submit all my code changes to the integration stream. Co worker integrates my code removes all my changes that breaks his hacky crap. Then complains his stuff doesn't work. I ask him why he he did not conform to the requirments says cause this is what worked before. I look at code see he assigns a value in the message to zero. I ask ever so politely why he is changing the incomming messages. He says this is what works. I Then send an email to him telling him this in an error. He reply saying this it what works. At stand up he complains and says no messages are getting through it doesn't work. The team tells him to revert to the original code. (My code) and update his code after two days of emails to bosses and complaining he reports it works with my code after he is done. He is the senior senior chief grand Pooba and makes more money than me.