Hello!

When I run this show an error message: 
 Specified method is not supported. {Name = 
"PolymorphicQuerySourceDetector" FullName = 
"NHibernate.Hql.Ast.ANTLR.PolymorphicQuerySourceDetector"}

I have two entity employees and employeeTitles. I use QueryA in QueryB. I'm 
suprised when see the error message. Can anyone help me? Do you have any 
way to work arround this situation?

IQueryable QueryA (){
return from p in *employeeTitles*
       group p by p.Employee.Id into grp
       select grp.*OrderByDescending*(g => g.StartDate).First();
}

IQueryable QueryB () {
 return employees.Join(*QueryA*, e => e.Id, et => et.Employee.Id, (e, et) 
=> new { e, et })
                            .OrderBy(eet => eet.e.FirstName)
                            .Select(x => new EmployeeDto()
                                {
                                    Id = x.e.Id,                           
  
                                    FirstName = x.e.FirstName,
                                    LastName = x.e.LastName,
                                    MiddleName = x.e.MiddleName,
                                    JoinedDate = x.e.JoinedDate,
                             
                                });
}

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