Cal. Fam. Code § 7648.4

Notwithstanding any other provision of law, if the court grants a motion to set aside or vacate a paternity judgment pursuant to this article, the court shall vacate any order for child support and arrearages issued on the basis of that previous judgment of paternity. The previously established father has no right of reimbursement for any amount of support paid prior to the granting of the motion.