SAN FRANCISCO — The California Supreme Court has agreed to review a decision that would require Sheppard, Mullin, Richter & Hampton to refund fees to a former client who wasn’t informed that the firm had flagged a potential conflict of interest.

Kevin Rosen of Gibson, Dunn & Crutcher, who is representing Sheppard Mullin in the case, petitioned the state high court in March after a January decision by a California appellate court went in favor of its former client, J-M Manufacturing Co. Inc.