(1) Except as otherwise provided in ORS 109.751, a court of this state that has made a child custody determination consistent with ORS 109.741 or 109.747 has exclusive, continuing jurisdiction over the determination until:
(a) A court of this state determines that neither the child, nor the child and one parent, nor the child and a person acting as a parent have a significant connection with this state and that substantial evidence is no longer available in this state concerning the child’s care, protection, training and personal relationships; or
(b) A court of this state or a court of another state determines that the child, the child’s parents and any person acting as a parent do not presently reside in this state.
(2) A court of this state that has made a child custody determination and does not have exclusive, continuing jurisdiction under this section may modify that determination only if the court has jurisdiction to make an initial determination under ORS 109.741.