(1) A procurement unit:
(a) shall accept bids as provided in the invitation for bids; and
(b) may not open a bid until after the deadline for submitting bids.
(2) A person who submits a bid may not, after the deadline for submitting bids, make a change to the bid if the change is prejudicial to:
(a) the interest of the procurement unit; or
(b) fair competition.