(a) The corporation shall have 15 calendar days after receipt of an invoice at its designated payment office to notify the contractor of (1) defects in the delivered goods, property or services, (2) defects in the invoice, or (3) suspected improprieties of any kind.

(b) Except as provided in subdivision (c) of this section, when the corporation notifies a contractor of such defects or suspected improprieties and the contractor thereafter submits a corrected invoice or delivers corrected goods or services, the ROI date shall be the date upon which the corrected invoice or corrected goods or services are received by the corporation. If a corrected invoice or corrected goods or services are not required, the ROI date shall be the date upon which the corporation determines that the suspected improprieties have been resolved.

(c) If the corporation fails to notify a contractor of such defects or suspected improprieties within 15 calendar days of receipt of an invoice, the ROI date, as determined by subdivision (b) of this section, shall be adjusted to an earlier date by the number of days equal to the days in excess of 15 that the corporation took after receipt of an invoice to notify the contractor of the defects or suspected improprieties.