code: @Override
      public void afterEntityRemoved(EntityDescriptor<Solution_> entityDescriptor, Object entity) {
          FactHandle factHandle = kieSession.getFactHandle(entity);
          if (factHandle == null) {
              throw new IllegalArgumentException("The entity (" + entity
                      + ") was never added to this ScoreDirector.\n"
                      + "Maybe that specific instance is not in the return values of the "
                      + PlanningSolution.class.getSimpleName() + "'s entity members ("
                      + getSolutionDescriptor().getEntityMemberAndEntityCollectionMemberNames() + ").");
          }
          kieSession.delete(factHandle);
          super.afterEntityRemoved(entityDescriptor, entity);
      }
docs: public void beforeEntityRemoved(EntityDescriptor entityDescriptor, Object entity) // Do nothing