CA Fam Code Section 2060

(a)

Upon written application by a party, the clerk shall enter an order joining as a party to the proceeding any employee benefit plan in which either party to the proceeding claims an interest that is or may be subject to disposition by the court.

(b)

An order or judgment in the proceeding is not enforceable against an employee benefit plan unless the plan has been joined as a party to the proceeding.