(a) Unless otherwise specified by a contract provision, a proper invoice submitted by the contractor to the designated payment office shall be required to initiate payment for goods, property or services. As soon as any invoice is received in the designated payment office during normal business hours, such invoice shall be date-stamped. The invoice shall then promptly be reviewed by the authority.

(b) The authority shall notify the contractor within 15 calendar days after receipt of an invoice of:

(c) The existence of any defects or suspected improprieties shall prevent the commencement of the time period specified in section 504.3 of this Part until any such defects or improprieties are corrected or otherwise resolved.

(d) If the authority fails to notify a contractor of a defect or impropriety within the 15-calendar-day period specified in subdivision (b) of this section, the sole effect shall be that the number of days allowed for payment shall be reduced by the number of days between the 15th day and the day that notification was transmitted to the contractor. If the authority fails to provide reasonable grounds for its contention that a defect or impropriety exists, the sole effect shall be that the payment due date shall be calculated using the original date of receipt of an invoice.

(e) In the absence of any defect or suspected impropriety, or upon satisfactory correction or resolution of a defect or suspected impropriety, the authority shall make payment, consistent with any such correction or resolution and the provisions of this Part.