A custody decree rendered by a court of this State which had jurisdiction under Section 20-7-788 binds all parties who have been served in this State or notified in accordance with Section 20-7-792 or who have submitted to the jurisdiction of the court, and who have been given an opportunity to be heard. As to these parties the custody decree is conclusive as to all issues of law and fact decided and as to the custody determination made unless and until that determination is modified pursuant to law, including the provisions of this subarticle.