No determination of overpayment shall be based upon the disallowance by the Workmen’s Compensation Appeals Board of a claim of lien filed under subdivision (g) of Section 4903 of the Labor Code, or the allowance of such lien for less than the amount claimed as a lien, 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 amount claimed as a lien.