Can current price be modified after launching the negotiation?

Summary:

Current price is to be modified based on the quotes received initially.

Content (required):

While launching a negotiation a current price may be set which may not be a realistic price. Once initial quotes are received, a price nearer to the quotes will then be set as the current price in order to calculate realistic savings.

Currently if I amend the negotiation to modify the current price, the whole amendment needs to be acknowledged by the supplier and they need to resubmit their response.

Can the price be amended without the requirement of supplier acknowledgement and resubmission of responses since we are amending a detail not visible to the supplier?