public team class Ateam {
	public class Arole playedBy Aclass {
        //...
	}	
}

public team class Bteam {
	private final Ateam ateam;
	public class Brole playedBy Arole<@ateam> {
        //...
	}	
	public Brole lift(Arole<@ateam> as Brole brole) {
		return brole;
	}
}

public team class Cteam extends Ateam {
	public class Crole extends Arole playedBy Aclass {
	}
}

      Arole<@ateam> arole = ateam.lift(aclass);				
      bteam.lift(arole);						

    final Cteam cteam = new Cteam();
    final Bteam dteam = new Bteam(cteam);

    within(cteam) {
        within(dteam) {
            aclass.run();
         }
    }

Exception in thread "main" java.lang.ClassCastException: ua.in.hutorny.otj.exer14.Cteam$__OT__Crole
	at ua.in.hutorny.otj.exer14.Bteam$__OT__Brole._OT$run$base(Bteam.java)
	at ua.in.hutorny.otj.exer14.Bteam$__OT__Brole.run(Bteam.java:21)

The method lift(Arole<@bTeam.ateam>) in the type Bteam is not applicable for the arguments (Arole<@aTeam>)

public team class Bteam<Ateam ateam> {
        public Bteam() {
		super();
	}
        ...

public class TheTest {
	final Ateam aTeam = new Ateam();
	final Bteam<@aTeam> bTeam = new Bteam<@aTeam>();
	final Cteam cteam = new Cteam();
	final Bteam<@cteam> dteam = new Bteam<@cteam>();
	final Aclass aclass = new Aclass();
       ...