Linq to NHibernate wrapper issue using where statement

var expr = PredicateBuilder.False<Audit>();

foreach(CodedValue codedValue in auditEventIds)
{
  CodedValue cv = codedValue;
  expr = expr.Or(a => (a.EventId.Code == cv.Code) && (a.EventId.CodeSystemName == cv.CodeSystemName));
}

itemQuery = itemQuery.Where(expr);

var query = from l in context.info_log
            from a in context.application_info
            where l.app_id == a.app_id
            where l.level_nm == "ERROR" || l.level_nm == "FATAL"
            group l by new { a.app_id, a.app_nm } into lg
            select new
            {
              Id = lg.Key.app_id,
              Name = lg.Key.app_nm,
              Error = lg.Where(x => x.level_nm == "ERROR").Count(),
              Fatal = lg.Where(x => x.level_nm == "FATAL").Count(),
            };

var query = (from c in Session.Query<Puppy>()).Timeout(12);

var query = (from c in Session.Query<Puppy>());

query.Timeout(456);