No officer or employee of a state agency shall receive a salary, fee or loan, or any compensation or other thing of value from the foundation or withdraw funds from a foundation account for any purpose, without the written approval of the executive authority, except that (1) if the officer or employee is the executive authority of a constituent unit, the written approval shall be that of the chairman of the board of trustees of the constituent unit in accordance with a policy adopted by such board of trustees, and (2) if the officer or employee is the executive authority of a public institution of higher education, the written approval shall be that of the executive authority of the constituent unit.