I also discovered a bug in linq to opath transformation:
 
Class Event
{

            Person p;
            Action a;

}
 
Class Person
{

            String SocialSecurityNumber;

}
 
Class Unit
{

            String UnitNumber;

}
 
The Linq query “from Event e in repository.Find<Event>() where e.a.UnitNumber == “31” && e.p.SocialSecurityNumber == “1234” select e”
Will produce this opath: Event[exists(Unit[UnitNumber = '31-1' and SocialSecurityNumber = '1234'])]