S.C. Code Ann. § 13-1-720

All provisions of an executive order authorizing the issuance of the bonds in accordance with this article and any covenants and agreements constitute legally binding contracts between the division and the several holders of the bonds, regardless of the time of issuance of the bonds, and are enforceable by any holder by mandamus or other appropriate action, suit, or proceeding at law or in equity in any court of competent jurisdiction.