(a) A state agency may spend unappropriated funds only by:
(1) a warrant drawn by:
(A) the comptroller; or
(B) a state agency to which the comptroller has delegated authority to print warrants under Section 403.060; or
(2) an electronic funds transfer initiated by the comptroller.
(b) Subsection (a) applies only to funds that Section 404.046 or 404.069 or other law requires to be spent on warrants drawn or electronic funds transfers initiated by the comptroller.