When auctions are not enough letter of guarantee of the winner for the conclusion of the state contract?

VS emphasized that in the absence of other documents confirming justification considerably of reduced price delivered goods, such letters cannot be accepted as sufficient justification of cost contracts As one of experts of "AG" noted, the Supreme Court reminded what exactly on the customer, instead of the participant of purchases lies a duty to check validity of the price, and also possibility of deliveries goods. Another called VS weighed and reasonable approach at a legal assessment of the letter of guarantee on readiness to put goods, purchases provided by the participant as justification...