Artikel 47

Where a worker having contracted an occupational disease has received or is receiving compensation paid by the institution of a Contracting Party, and, in the event of an aggravation of his condition, claims benefits from the institution of another Contracting Party, the following provisions shall apply:
(a) where the worker has not followed, under the legislation of the second Party, an occupation liable to cause or to aggravate the disease in question, the competent institution of the first Party shall bear the cost of the benefits, taking the aggravation into account, in accordance with the provisions of the legislation which that institution applies;
(b) where the worker followed such an occupation under the legislation of the second Party, the competent institution of the first Party shall bear the cost of the benefits, leaving the aggravation out of account, in accordance with the provisions of the legislation which it applies; the competent institution of the second Party shall award to the worker a supplementary benefit the amount of which shall be equal to the difference between the amount of the benefits due after the aggravation and the amount of the benefits that would have been due before the aggravation, in accordance with the provisions of the legislation which that institution applies, if the disease in question had been contracted under the legislation of that Party.