9. Section 23 of the principal enactment is hereby amended in subsection (1) of that section, by the insertion immediately after paragraph (eee), of the following paragraph: "
" (eeee) a sum equal to one-tenth of any payment made, on or after April 1, 1990 by such person as consideration for the licensing, in his favour, or any manufacturing process used by him in any trade or business carried on by him : |
| Provided that no deduction under the provisions of this paragraph shall be allowed to any person in respect of any such payment if the total of the sums deducted in the preceding years of assessment is equal to the amount of such payment-". |