Cal. Civ. Proc. Code § 403.030

If a party in a limited civil case files a cross-complaint that causes the action or proceeding to exceed the maximum amount in controversy for a limited civil case or otherwise fail to satisfy the requirements for a limited civil case as prescribed by Section 85, the caption of the cross-complaint shall state that the action or proceeding is a limited civil case to be reclassified by cross-complaint, or words to that effect. The party at the time of filing the cross-complaint shall pay the reclassification fees provided in Section 403.060, and the clerk shall promptly reclassify the case.