Hmm. The removed query property still works. it just interferes with my compiling. made an hack with a derived roomquery class to avoid compiler noise. :p

 public class RoomQueryWrapper : RoomQuery
        {
            public new BooleanCriterion Removed
            {
                get
                {
                    return GetCriterion<BooleanCriterion>("Removed");
                }
                set
                {
                    SetCriterion("Removed", value);
                }
            }
        }