(1) Where the customer refuses to accept the work, citing defects, they are to cooperate, upon the contractor so demanding, in a joint determination of the status of the work that has been reached. The joint determination of the status reached is to state the date of its preparation and is to be signed by both contractual parties.
(2) Where the customer fails to attend a meeting agreed for determining the status of the work, or a meeting scheduled by the contractor within a reasonable time limit, the contractor also may determine the status of the work unilaterally. This does not apply if the customer fails to attend due to a circumstance for which they are not responsible and of which they have notified the contractor without undue delay. The contractor is to furnish the unilateral determination of the status with the date on which it was prepared, is to sign it and is to make available to the customer a copy of the unilateral determination of the status.
(3) Where the work has been procured to the customer and the determination of the status under subsections (1) or (2) does not cite any evident defects, the presumption is that such evident defect arose after the determination of the status and is the responsibility of the customer. This presumption does not apply if the defect, by its nature, cannot have been caused by the customer.
(4) The remuneration is to be paid when
1. the customer has accepted the work or if the acceptance may be dispensed with pursuant to section 641 subsection (2)
2. the contractor has issued to the customer an auditable final invoice.
The final invoice is auditable if it includes an easily surveyed list of the work performed and is logically understandable to the customer. It is considered auditable unless the customer finds fault, citing their reasons therefor, as to the final invoice’s auditability within 30 days of having received it.