For the purpose of applying Article 19:
- a)where a compulsory insurance period completed under the legislation of one Party coincides with a voluntary insurance period completed under the legislation of the other Party, only the compulsory insurance period shall be taken into account, provided that the amount of pension payable under the legislation of the latter Party under Article 19(2) shall be increased by the amount by which the pension payable under the legislation of that Party would have been increased if all voluntary contributions paid under that legislation had been taken into account;
- b)where a contribution period completed under the legislation of one Party coincides with an equivalent period completed under the legislation of the other Party, only the contribution period shall be taken into account;
- c)where an equivalent period completed under the legislation of one Party coincides with an equivalent period completed under the legislation of the other Party, account shall be taken only of the equivalent period completed under the legislation under which the insured person was last insured before the day when the periods in question began or, if he was never insured before that day, under the legislation under which he first became insured after the day when the periods in question ended;
- d)where a compulsory contribution period completed under the legislation of one Party coincides with a compulsory contribution period completed under the legislation of the other Party, each Party shall take into account only the compulsory contribution period completed under its own legislation;
- e)where a voluntary contribution period completed under the legislation of one Party coincides with a voluntary contribution period completed under the legislation of the other Party, each Party shall take into account only the voluntary contribution period completed under its own legislation;
- f)where it is not possible to determine accurately the period of time in which certain insurance periods were completed under the legislation of one Party, such insurance periods shall be treated as if they did not overlap with insurance periods completed under the legislation of the other Party and shall be taken into account to the best advantage of the beneficiary.
