I have a MRP group created for 50% safety stock and assigned to a particular material. The material is with MRP type PD, Lot size EX, safety stock and min. lot size is maintained as 200 and the rounding value as 10. When MRP is run, I am getting exception message 30 for the planned order. The reqmt date is 09/20/2010 and the rescheduling date is 09/08/2010. Need to know why this exception message is given by the system, its significance and how to avoid this exception message not to show up.