Posted on behalf of LHS.
Massachusetts has a certain kind of race (which won't occur again until 2004) which has a candidate type called "no preference". If the voter marks the No Preference candidate, the voter is allowed to cast a write-in vote. The Accu-Vote must recognize this and give the vote to the write-in space, whereas if the voter votes for a named "candidate" type candidate and also marks the write-in space, that should be counted as an overvote.
This is the whole point of the Preference write-in tally setting. Somewhere in the system, the user must be able to create a candidate of the type "no preference". I am advised this should be posted as a bug, not an rcr.