How to use Rule Groups in BW Transformation 10. March 2015 in Data Warehousing, DW Developers by sapbwmentor Overview Based on my experience, many BW developers use transformation and many of them implement ABAP in several places: Start Routine, End Routine, Field calculation etc. So these options are widely used and known. During my trainings I receive questions from developers where we come to the conclusion that many people miss the opportunities and the power of the Rule Groups. I agree, this function hides behind a dropdown list and we can easily miss it. In this post I want to highlight the functionality behind the hiding Rule Groups dropdown list.