The obvious manual insertions are when your roster gets emailed to you, and the same day you call Evita and have a roster change.
If they have done the insertion before emailing you the roster, it's harder to proove your case. However, with my style of bidding it's easy, as I rank all the trips in teh system. If I get a trip that's on the bottom of the list, especially at the top 3 months, then it's obvious that the trip was not assigned by the computer.