9. The holder of a certificate of accreditation is not obliged to comply with paragraph 1 of section 5 or with paragraphs 1 and 2 of section 6 in respect of an accredited bookstore if the holder can prove with supporting vouchers that the bookstore has not respected the normal deadline for the payment of its purchases.
R.R.Q., 1981, c. D-8.1, r. 2, s. 9.