Invoke transactional method within the same SFSB
@TransactionAttribute(TransactionAttributeType.NOT_SUPPORTED)
@Stateless
public class MyService {

    @Resource
    SessionContext ctx;

    public void myMethod()  {
        // do something...

        // invoke method from the same class

        // As expected - this doesn't work as it's a regular local-call,
        // it's not aware of EJB nature of this call.
        save();

        // Doesn't work (although it worked with SLSB)
        ctx.getBusinessObject(MyService.class).save();
    }

    @TransactionAttribute(TransactionAttributeType.REQUIRES_NEW)
    public void save() {
        // do something...
    }
}