GoodData Business Intelligence Project

We are linking our Microsoft SQL Database to GoodData Business Intelligence ([login to view URL]). We are looking for somebody who has excellent experience of using GoodData and the GoodData CloudConnect ETL. We already have the project 90% complete ourselves and have verified that the Views in our SQL database which we are publishing to GoodData are correct. However, we seem to be making errors in the GoodData Model as when we run reports in GoodData we are getting different results than we would expect when running the same report in SQL. Please only reply to this if you are very familiar with the GoodData Cloud Connect Modelling.