I have a table that contains 2 columns, updated_on and updated_by, that are updated by an update trigger in the database (SQLServer 2005).  The BO's fill method uses a simple "SELECT * FROM TABLE" statement.  Whenever I update a particular row more than once using the same instance of the BO, I get a data collision on the updated_on column.  Since the user doesn't directly update the updated_on/by columns I changed the SELECT statement in the BO not to return them.  The data collision problem has now gone away.

Should I keep columns updated by triggers out of updateable BOs?