Complaints very often deal with suppliers who have been excluded based on criteria the complainant doesn't agree with: contradictory terms in the call for tenders; ambiguous language; specifications that were over-restrictive or biased towards a certain or specific product; insufficient time to bid, or failure to grant a time extension when one was justified; a bidder being permitted to effectively modify their proposal after the deadline for receipt of proposals had passed; improper clarification processes; unsuccessful bidders not being provided adequate debriefings; and improper application of limited tendering, or sole-sourcing—though this is less frequent now.
On May 29th, 2008. See this statement in context.