I’m afraid I can’t give a complete statement (I don’t have the statements our BI department uses), but at least I could help you developing it. Which version are you using (POB 21 or POB G6?) And do you have a separate History Event for the change of Responsibile User? Do you use the Responsible/ResponsibleGroup fields in that event? The whole thing is to extract the information who did it when and who got the responsibility – out of the history lines, queried by the history action ID.