The contract documents are complementary-

The conflict/dispute has a cost element which is quantifiable and the contractor, in case of genuine claim, is able to demonstrate the impact on his planned/budgeted project cost by submitting cost analysis and supporting evidences .He is also in a position to argue his case and request for amendment to contract to include such additional cost . But some Clients have the tendency to take shelter under the such contract terms(Complementary) to argue/defend their stand to reject the claim.Thus it becomes an uphill task for the contractor to resolve conflicts/dispute amicably.

The "complementary" clauses do not have standing unless they are explicitly stated (agreed to) or read into the contract by a court of law. Hopefully you can resolve the issue without going to court.