CALIFORNIA FAMILY LAW
...Procedure After Trial/Hearing
......Attack on Judgments/Orders
.........Void Judgments/Orders/Defaults
............Estoppel to Challenge
2 Cards On This Topic:

Order which exceeds fundamental jurisdiction may be void, whereas party who stipulates to order which is simply in excess of jurisdiction may be precluded from challenging.

Once parentage is determined in divorce decree, parties are estopped to relitigate in later proceeding.