Section 20. Credit and debit notes:

(1) Where a tax invoice has been issued and the amount shown as tax charged in the tax invoice exceeds the tax chargeable under this Act in respect of that sale, the registered dealer making the sale shall provide the purchaser with a credit note containing the requisite particulars as prescribed. (2)Where tax invoice has been issued and the tax chargeable under this Act in respect of the sale exceeds amount of tax charged in that tax invoice, the registered dealer making the sale shall provide the purchaser with a debit note containing the requisite particular as prescribed. (3) In case of goods returned or rejected by the purchaser, a credit note shall be issued by the selling dealer to the purchaser and a debit note will be issued by the purchaser to the selling dealer containing particulars of the transaction as prescribed.