There are two issues here :
1. If the additional boat helps the Contractor achieve efficiencies elsewhere on the contract, then there will presumably reductions in Defined Costs due to the compensation event elsewhere. These should be part of the overall assessment.
2. It is not clear where you are in the timeline of quotes etc. , but my concern is that the Contractor is trying to open up a previously agreed CE quotation and you are going along with it. If a CE has been implemented - by which I mean either the PM has accepted it and the PM has notified the Contractor of his/her own assessment, then it cannot be re-visited unless an PM assumption changes.
1. If the additional boat helps the Contractor achieve efficiencies elsewhere on the contract, then there will presumably reductions in Defined Costs due to the compensation event elsewhere. These should be part of the overall assessment.
2. It is not clear where you are in the timeline of quotes etc. , but my concern is that the Contractor is trying to open up a previously agreed CE quotation and you are going along with it. If a CE has been implemented - by which I mean either the PM has accepted it and the PM has notified the Contractor of his/her own assessment, then it cannot be re-visited unless an PM assumption changes.