[rules-users] Problem with chained planning variables

Hi everybody. I have a problem with chained planning variables. I'm using optaplanner 5.5.0.Final. I have a planning entity like: @PlanningEntity() public class Case implements Chained { private Chained previous; @PlanningVariable(chained = true) @ValueRanges({ @ValueRange(type = ValueRangeType.FROM_SOLUTION_PROPERTY, solutionProperty = "doctors"), @ValueRange(type = ValueRangeType.FROM_SOLUTION_PROPERTY, solutionProperty = "cases", excludeUninitializedPlanningEntity = true) }) public Chained getPrevious() { return previous; } } A fact class: public class Doctor implements Chained { ... } An a solution class: public class Plan extends implements Solution<HardAndSoftScore> { private List<Doctor> doctors; private List<Case> cases; private HardAndSoftScore score; @PlanningEntityCollectionProperty public List<Case> getCases() { return cases; } public Collection<? extends Object> getProblemFacts() { return new ArrayList<Doctor>(doctors); } } The equals / hashCode / clone methods are inspired on the TravelingSalesmanTour example. I want that Optaplanner generates chains like: DoctorA <- Case1 <- Case2 DoctorB <- Case3 This model tries to represent a list of Cases assigned to each Doctor. Suppose I build a solution like: Plan plan = new Plan(); plan.setDoctors(DoctorA, DoctorB); //pseudo-code plan.setCases(Case1, Case2); //pseudo-code Then I build a solver: Solver solver = getSolverFactory().buildSolver(); solver.setPlanningProblem(plan); solver.solve(); Plan bestPlan = (Plan) solver.getBestSolution(); The problem is that, Optaplanner is not testing all the posible combinations of chains. I mean, suppose that we know that the better solution (based on the scoring rules) is: DoctorA DoctorB <- Case1 <- Case2 But Optaplanner seems to test only chains with DoctorA, so the result of calling getBestSolution() is: DoctorA <- Case1 <- Case2 I guess that Optaplanner only test chains whit DoctorA, becouse it logs lines like: ... DEBUG: org.drools.planner.core.localsearch.DefaultLocalSearchSolverPhase - Step index (1), time spend (20002), score (1hard/2soft), best score (1hard/2soft), accepted/selected move count (0/58187) for picked step (Case [id=2, previous=Doctor [id=1]] => Case [id=1, previous=Case [id=2, previous=Doctor [id=1]]]). ... That is, no lines whith "DoctorB" are logged. If the doctor list is inverted, the same problem happen (the DoctorA is no processed). That is: Plan plan = new Plan(); plan.setDoctors(DoctorB, DoctorA); //pseudo-code plan.setCases(Case1, Case2); //pseudo-code Solver solver = getSolverFactory().buildSolver(); solver.setPlanningProblem(plan); solver.solve(); // DoctorA is not part of chains I guess the problem is on the solver configuration, specifically on the localSearch configuration: <localSearch> <unionMoveSelector> <changeMoveSelector> <valueSelector/> </changeMoveSelector> <swapMoveSelector /> <subChainChangeMoveSelector> <selectReversingMoveToo>true</selectReversingMoveToo> </subChainChangeMoveSelector> <subChainSwapMoveSelector> <selectReversingMoveToo>true</selectReversingMoveToo> </subChainSwapMoveSelector> </unionMoveSelector> <acceptor> <planningEntityTabuSize>9</planningEntityTabuSize> </acceptor> <forager> <minimalAcceptedSelection>2000</minimalAcceptedSelection> </forager> </localSearch> I tried some alternatives to this configuration, but with no success. Do you know what I am doing wrong? Thanks a lot. Regards