The general contracting service fee is included in the bidding, can the general contracting service fee be adjusted when preparing the completion settlement?

Preparation of the tender price, the general contracting service fee shall be based on the bidder in the bidding documents listed in the subcontracting of professional engineering content and supply of materials and equipment, in accordance with the bidder's proposed coordination, cooperation and service requirements and construction site management needs to be determined by the bidders themselves. Preparation of the completion of the settlement, the general contracting service fee shall be based on the amount agreed in the contract, the issuer, the contractor and the contracting parties in accordance with the contract agreement on the general contracting service fee adjusted, shall be calculated according to the adjusted amount.