Key legal question
Whether the constitutional complaint was admissible despite the contract already being signed with the successful bidder.
Extracted holding
The complaint remained admissible; the request to annul the award was treated as a request for a declaration of federal unlawfulness.
Extracted reasoning
A concluded contract does not remove the losing bidder's practical interest, because a declaration may still matter for a possible damages claim under Art. 9(3) BGBM.