Simultaneous proceedings.

If a proceeding for enforcement under this subchapter is commenced in a court of the District and the court determines that a proceeding to modify the determination is pending in a court of another state having jurisdiction to modify the determination under subchapter II of this chapter , the enforcing court shall immediately communicate with the modifying court. The proceeding for enforcement continues unless the enforcing court, after consultation with the modifying court, stays or dismisses the proceeding.