I have following code: // from A11 and A12 and back struct Ev1 : sc::event < Ev1 >{}; struct Ev2 : sc::event < Ev2 >{}; // from A to B and back struct Ev3 : sc::event < Ev3 >{}; struct Ev4 : sc::event < Ev4 >{}; // from A1 to A2 and back struct Ev5 : sc::event < Ev5 >{}; struct Ev6 : sc::event < Ev6 >{}; struct StateA; struct StateA1; struct StateA11; struct StateA12; struct StateA2; struct StateA21; struct StateA22; struct StateB; struct Machine : sc::state_machine < Machine, StateA > {}; struct StateA : sc::simple_state < StateA, Machine, mpl::list < sc::deep_history < StateA1 > >, sc::has_deep_history > { typedef sc::transition < Ev3, StateB > reactions; }; struct StateA1 : sc::simple_state < StateA1, StateA, mpl::list < sc::deep_history < StateA11 > >, sc::has_deep_history > { typedef sc::transition < Ev5, StateA2 > reactions; }; struct StateA11 : sc::simple_state < StateA11, StateA1 > { typedef sc::transition < Ev1, StateA12 > reactions; }; struct StateA12 : sc::simple_state < StateA12, StateA1 > { typedef sc::transition < Ev2, StateA11 > reactions; }; struct StateA2 : sc::simple_state < StateA2, StateA, mpl::list < sc::deep_history < StateA21 > >, sc::has_deep_history > { typedef sc::transition < Ev6, StateA1 > reactions; }; struct StateA21 : sc::simple_state < StateA21, StateA2 > {}; struct StateA22 : sc::simple_state < StateA22, StateA2 > {}; struct StateB : sc::simple_state < StateB, Machine > { typedef sc::custom_reaction < Ev4 > reactions; sc::result react(const Ev4&) { std::cout << "react" << std::endl; return transit < sc::deep_history < StateA11 > >(); } }; I am sending events like this: Machine m; m.initiate(); std::cout << "Ev5" << std::endl; m.process_event(Ev5()); std::cout << "Ev3" << std::endl; m.process_event(Ev3()); std::cout << "Ev4" << std::endl; m.process_event(Ev4()); After Ev5 machine goes to A2 -> A21 state. After Ev3 machine leaves state A with history and goes to state B. After Ev4 machine leaves state B and should go back to A2 -> A21 but actually goes to A -> A1 -> A11 - default states. How I can fix it? Thanks, Ilya