21. Limitation of expenditure
(1) Where, but for the provisions of this subparagraph, an amount qualifies or has qualified as an allowable expenditure or may otherwise be taken into account in determining a capital gain or capital loss under more than one provision of this Schedule, that amount or portion thereof, shall not be allowed as expenditure or be taken into account more than once in determining that capital gain or capital loss.
(2) No expenditure shall be allowed under paragraph 20(1)(a) or (e) where any amount of that expenditure is allowable under any other provision of this Schedule, despite that that other provision imposes any limitation on the amount of the expenditure.