Iowa Code § 12.5
The treasurer shall pay no money from the treasury but upon the warrants of the director of the department of administrative services, and only in the order of their presentation.
Warrants not paid for want of funds, chapter 74
[C51, §65; R60, §86; C73, §78; C97, §104; S13, §104; C24, 27, 31, 35, 39, §135; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §12.5] 2003 Acts, ch 145, §286