i have the following query and its failing in Nhibernate 3 LINQ witha a "Non supported" exception.

My DB tables are:

1. VacationRequest (id, personId)
2. VacationRequestDate (id, vacationRequestId)
3. Person (id, FirstName, LastName)

My Entities are:

1. VacationRequest (Person, IList)
2. VacationRequestDate (VacationRequest, Date)

Here is the query that is getting a "Non supported" Exception

 Session.Query<VacationRequestDate>().Where(r => people.Contains(r.VacationRequest.Person, new PersonComparer())).Fetch(r=>r.VacationRequest).ToList();

is there a better way to write this that would be supported in Nhibernate?

fyi . .the PersonComparer just compared person.Id