California Code of Civil Procedure Section §706.023
(Gen. Provisions)
Except as otherwise provided in this chapter:
(a) An employer shall comply with the first earnings withholding order served upon the employer.
(b) If the employer is served with two or more earnings withholding orders on the same day, the employer shall comply with the order issued pursuant to the judgment first entered. If two or more orders served on the same day are based on judgments entered upon the same day, the employer shall comply with whichever one of such orders the employer selects.
(c) If an earnings withholding order is served while an employer is required to comply with another earnings withholding order with respect to the earnings of the same employee, the subsequent order is ineffective and the employer shall not withhold earnings pursuant to the subsequent order.
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