Tex. Gov't Code § 864.011

The cashing or depositing of the first payment of a service retirement annuity, disability retirement annuity, or death benefit annuity by a person entitled to it, or the receipt by a financial institution for credit to that person's account of a transfer of funds by the pension system through electronic means, is considered acceptance of the amount of the annuity and of the amount of qualified service of the person on whose service the annuity is based.