docs: public void setVariable(String variableName, Object value, String targetActivityId) {
      String activityId = getActivityId();
      if (activityId != null && activityId.equals(targetActivityId)) {
        setVariableLocal(variableName, value);
      } else {
        PvmExecutionImpl executionForFlowScope = findExecutionForFlowScope(targetActivityId);
        if (executionForFlowScope != null) {
          executionForFlowScope.setVariableLocal(variableName, value);
        }
      }
    }