(a) Except as otherwise provided by statute, if a party against whom a complaint has been filed and served fails to allege in a cross-complaint any related cause of action which (at the time of serving his answer to the complaint) he has against the plaintiff, such party may not thereafter in any other action assert against the plaintiff the related cause of action not pleaded.
(b) This section does not apply if either of the following are established:
(1) The court in which the action is pending does not have jurisdiction to render a personal judgment against the person who failed to plead the related cause of action.
(2) The person who failed to plead the related cause of action did not file an answer to the complaint against him.
(Added by Stats. 1971, Ch. 244.)