Where a bidder considers that the terms, specifications, or basis of a tender are unlawful, unfair, irrational, or unreasonable, it must challenge those terms at the time the tender is advertised, before the process unfolds. A bidder may not participate in the tender process, acquiesce in the alleged unfairness, and then raise the unfairness as a ground of review after the tender has been awarded to a competitor. This principle ensures that fairness operates reciprocally and promotes the constitutional values of transparency, cost-effectiveness, competitiveness, and equitableness under section 217 of the Constitution.