When the municipal gross receipts tax is stated separately on the books of the seller or lessor, and if the total amount of tax that is stated separately on transactions reportable within one reporting period is in excess of the amount of municipal gross receipts tax otherwise payable on the transactions on which the tax was stated separately, the excess amount of tax stated on the transactions within that reporting period shall be included in gross receipts. (Ord. 1101-78 § 6, 1978).