6. For the purposes of this voluntary undertaking, the pricing error of a good in an advertisement shall not be taken into account in the calculation of the pricing error rate nor for the application of the accurate pricing policy described in section 1 as of the moment when the merchant posts, in a conspicuous place, a mention of the error and the correction made, near the place where the good is sold and near the check-outs in the establishment. This provision does not restrict the scope of subparagraph c of the first paragraph of section 224 of the Consumer Protection Act (chapter P-40.1).