What is the legal consequence of one contracting party asserting the existence of deficiencies or defects in the works completed by the other party without providing valid evidence?

The assertion of one contracting party regarding the existence of deficiencies or defects in the works completed by the other party shall not be given weight if they fail to provide valid documents specifying the nature and extent of those deficiencies or defects, or if they fail to enumerate the completed works or have them inspected by an expert entity before engaging a third party to rectify them.