Justa, I know I have done it several times . But , I do believe there is an option on that same page that states " or press continue to proceed without entering them" or something to that effect . The benefit of actually putting them in the VIR database , is that in two years if some other tech decides to fail it for aftermarket part , hopefully the BAR can look at the smog check and see that that particular EO number was entered two years ago . so they can see you were right and other guy was wrong and not DING your star number . But then ,why doesn't the VIR for the OIS show us the EO numbers when we do remember to enter them ?