It would depend on the order of precedence called out in the contract. Depending on what the contractual terms are the order could vary. Without more information I would hesitate to provide a conclusive answer to the question. If you could provide a it more detail it would be greatly appreciated.
• Airbus Defence and Space GmbH
The logic would tell me to start with the particulars and then the general conditions of a Contract :-) usually I try to avoid putting the tender and it's acceptance into the contract as the contract should reflect this accosringvto parties agreement as well ! For me the contract should be the ultimate and final agreement between the Parties! Hope that helps!
-Bid Bond is generally kept as 1%-3% of the estimated Budget and all Bidders should be requested to submit the Bid Bond of the same value, in a Bid Bond format to be provided by the Company in the Bid document.
-The Bid Bond must be verified at the time of opening the Bids. In most of the government tenders , Bids are rejected if the Bid Bond with correct amount and validity is not accompanied along with the Bid.
-Bid Bond must be valid up to the time requested in the Bid document for the validity of Bids.In case of extension requested for validity of Bids from the Bidders the Bid Bond must also be extended accordingly.
-Bid Bond should be released within 30 days after the announcement of successful Bidder / immediately if the tender is cancelled.
Sounds like your Finance/Audit rep should weigh in - this might be better done just as an amount discounted/due at signing, e.g. as if the new charging model had been in place September1. Applying new service terms and obligations retroactively sounds like a recipe for unintended problems (how could you have performed properly if the amends weren't agreed yet?). To be accurate to the conditions upon signing, you'd have to set up an corrective procedure and/or some no-fault arrangement for the backdated period - risk: it all still looks odd to your auditor...