In this model, flowitems move between work centers like this: 85A > 89Q > 899 > 85V > 85A but when being processed at 85A and 85V, the flowitems need to undergo two operations back-to-back before being moved to the OutRack. The possibility of a flowitem failing and being moved to a rework queue should also be present during either operation, not just at the end when both operations are complete. Is there a way to build this into the process flow so I can continue to use processors, or do I need to change the processors at these work centers to multiprocessors? How can I build in logic to represent flowitems failing before both operations have ended?