Gov. Code, § 17251

The cancellation, invalidity or abatement, in whole or in part, of any such claim, or of any warrant drawn against the General Cash Revolving Fund, does not invalidate or otherwise affect any registered reimbursement warrant. The certificate of the Controller relative to any of the matters required to be found, determined or exist as a condition to or in connection with the issuance, registration or sale of registered reimbursement warrants, or the making or auditing of any demand, or in respect to the issuance of warrants on the General Cash Revolving Fund is conclusive in favor of any holder of any registered reimbursement warrant.