Ill. Admin. Code tit. 44, § 8.2040
b) Cancellation of Solicitation; Rejection of All Bids or Proposals
B) the State no longer can reasonably expect to fund the procurement;
D) ambiguous or otherwise inadequate specifications;
3) The notice of cancellation shall:
B) briefly explain the reason for cancellation or rejection; and
c) Rejection of Individual Bids or Proposals
1) Individual bids or proposals may be rejected for reasons including, but not limited to: