Section 10 of the Principal Act is hereby amended -
(a) in subsection (3) by the addition of the following paragraph:
"(d) If, following the issue of an invoice by a taxable person in respect of a supply of goods or services, the person who issued the invoice allows a reduction or discount in the amount of the consideration due in respect of that supply, the relief referred to in paragraph (c) shall not be given until the person who issued the invoice issues the credit note required in accordance with the provisions of section 17(3) (b) in respect of that reduction or discount.",
(b) by the addition of the following proviso to subsection (4):
"Provided that where the supply in question is a supply of immovable goods, (hereafter referred to in this proviso as ‘appropriation’), the cost to the person making that appropriation shall include an amount equal to the amount on which tax was chargeable on the supply of those goods to that person, being the last supply of those goods t