No claim of overpayment shall be based upon the disallowance by the Workmen’s Compensation Appeals Board of a claim of lien filed under § 4903 of the Labor Code, or the allowance of such lien for less than the amount claimed, or upon the approval by the said appeals board of a compromise and release agreement providing for the allowance of such lien in an amount less than the claim.

(Amended by Stats. 1967, Ch. 1484.)