(a) A warrant may not be drawn or an electronic funds transfer initiated until:
(1) the state agency from whose appropriated or unappropriated funds the warrant or electronic funds transfer is payable has submitted a voucher to the comptroller;
(2) the state agency has approved the voucher in accordance with this chapter; and
(3) the comptroller has audited and approved the voucher as required by law.
(b) A state agency's approval of a voucher includes the agency's approval of any interest that must be paid at the same time the principal amount is paid to a vendor under Chapter 2251. In this subsection, "state agency" has the meaning assigned by Section 2251.001.