The officers and agencies of this Commonwealth and its subdivisions having authority to place children are hereby empowered to enter into supplementary agreements with appropriate officers or agencies in other party states pursuant to subdivision (b) of Article V of the compact pursuant to Chapter 10 (§ 63.2-1000 et seq.) of this title. Any such agreement which contains a financial commitment or imposes a financial obligation on this Commonwealth or on a subdivision or agency thereof is subject to the written approval of the State Comptroller and of the chief fiscal officer of the subdivision involved.