(B) Operative October 1, 2007, for purposes of this subdivision, when a retailer contracts with its customer for the addition of sales tax reimbursement to the gross receipts of tangible personal property sold at retail, or when a retailer is obligated to collect use tax measured by the sales price, the retailer is required to disclose to the customer the amount upon which sales tax reimbursement or use tax is collected, including the amount of any taxable discounts, rebates, or incentives offered or paid to the retailer by third parties. The retailer may show the amount upon which sales tax reimbursement or use tax is collected on the customer's sales receipt, sales invoice, or other proof of sale. When applicable, the retailer may also post on its premises in a location visible to the customer, or in an advertisement or other printed material directed to customers, a notice to the effect that "tax" will be added to the selling price of all items, including the amount of any taxable discounts, rebates, or incentives offered or paid to the retailer by third parties. A retailer that does not disclose the amount of any taxable discounts, rebates, or incentives upon which sales tax reimbursement is collected, is in violation of the provisions of Regulation 1700, Reimbursement forSales Tax. A retailer obligated to collect the use tax that does not disclose the amount of any taxable discounts, rebates, or incentives is in violation of the provisions of Regulation 1686, Receipts for Tax Paid to Retailers.