Trialing manufacturing control plans with serial number tracking turned on (order based, one lot per, no multi level or inventory). I have to RMB in the Analysis header to “Enter Serial Numbers” before I am able to enter the Serial No on the separate data point lines (variables not attributes). Once I've entered one or all Serial Nos when I try to save the entered Serial Nos disappear and I am still unable to save my results because my Serial No is not populated. Anyone have any ideas as to why?