Not once, not twice I've search for a solution to do changes in routings (task lists) in some wise way. I hate BDC but in this case I thought that there is no other solution. Fortunately I was wrong ...
In article Delete Routing - piece of cake I've shown you how to use FM from CEWB transaction to delete routings. If you go through all FM that are inside function groups of CEWB then you'll see ...