[rules-users] [Flow] Waiting for certain Event based on Event-Data

Hi, i've got multiple workitems, i want to process via my workflow so i'm starting my workflow once with every workitem passed as variable (so they are running simultaneously) in the workflow i sometimes have to wait for an event to occur - but such an event is only linked to one of the workitems i added an (Message) Event Node followed by a Join so the process Blocks class Event{ string ItemId; } after receiving the event i could check if the ItemId equals the one of the workitem, but if that's not the case i would have to go one step back and AGAIN listen for the event. can i somehow make a loop or anything else, so the process blocks until an Event with the right ItemId occurs? regards