The Contract may contain provisions addressing the way the Authority and the Contractor do business with each other in relation to the Contract.
The WIDP Contract (Clause 90) requires each party to act in good faith and to deal in a timely manner with all obligations under the Contract. It also makes clear that any review (or lack of it) by the Authority of any details of the construction process or the provision of the services shall not relieve the Contractor from any obligation under the Contract.
In a similar way, the WIDP Contract (Clause 1.7) makes it clear that if the Authority were to give its approval to a particular matter, that approval would not negate the Contractor's duty to comply with its duties under the Contract and/or any Ancillary Documents, nor would it negate any duty of the Contractor to ensure the matter itself was accurate when put to the Authority for approval.
The Contract Management Manual should highlight these contractual obligations in the section dealing with the relationship with the Contractor.