(a) If the General Assembly has established by law the maximum annual salaries for certain positions for a state agency and has appropriated for those positions, a greater salary than that established by law shall not be paid to a person occupying the position by making supplemental payments from agency bank funds.
(b) However, the salaries under subsection (a) of this section may be paid partly from state-appropriated funds and partly from agency bank funds, but the aggregate of the payments shall not exceed the maximum annual salary rate, when the maximum annual salary rate is established by law.