(2) Where a person has suffered an aggravation of an industrial disease for which benefit has been paid in accordance with paragraph (1), the following provisions shall apply:
(a)if the person has not had further employment in an occupation to which the disease or the aggravation may be attributed, or has had such employment only in the territory of the Party under whose legislation benefit has been paid, any additional benefit to which he may become entitled as a result of such aggravation shall be payable only under that legislation;
(b)if the person makes a claim under the legislation of the Party in whose territory he is employed on the ground that he has suffered an aggravation of the disease while he was employed in the territory of that Party in an occupation to which, under the legislation of that Party, the aggravation may be attributed, the competent authority of that Party shall be liable to pay benefit only in respect of the aggravation as determined under the legislation of that Party.