code: @Override
      public void afterEntityAdded(EntityDescriptor<Solution_> entityDescriptor, Object entity) {
          if (entity == null) {
              throw new IllegalArgumentException("The entity (" + entity + ") cannot be added to the ScoreDirector.");
          }
          if (!getSolutionDescriptor().hasEntityDescriptor(entity.getClass())) {
              throw new IllegalArgumentException("The entity (" + entity + ") of class (" + entity.getClass()
                      + ") is not a configured @PlanningEntity.");
          }
          if (kieSession.getFactHandle(entity) != null) {
              throw new IllegalArgumentException("The entity (" + entity
                      + ") was already added to this ScoreDirector."
                      + " Usually the cause is that that specific instance was already in your Solution's entities" +
                      " and you probably want to use before/afterVariableChanged() instead.");
          }
          kieSession.insert(entity);
          super.afterEntityAdded(entityDescriptor, entity);
      }
docs: public void beforeEntityAdded(EntityDescriptor entityDescriptor, Object entity) // Do nothing