“Effect” is not a good word for it. Maybe “messes up”, “disturbs”, or “kills” is better. After installing the Cumulative Update (CU) referred to as KB 2429050 everything seemed ok until some of the jobs collecting in/out statistics from the DTA database...
Ok read it again … Yes you are right! BizTalk is looking for an element of the same name in the same namespace and yet it does not validate. What is this? The answer is that the data uses ElementFormDefault: Qualified and the schema uses ElementFormDefault...