Article 72 2.

By way of derogation from paragraph 1, if, when awarding or reviewing benefits in respect of invalidity benefits, old-age and survivors’ pensions pursuant to Chapter 4 and 5 of Title III of the basic Regulation, the institution of a Member State has paid to a person benefits of undue sum, that institution may request the institution of any other Member State responsible for the payment of corresponding benefits to the person concerned to deduct the amount overpaid from the arrears payable to the person concerned. After the latter institution has informed the institution that has paid an undue sum of these arrears, the institution which has paid the undue sum shall within two months communicate the amount of the undue sum. If the institution which is due to pay arrears receives that communication within the deadline it shall transfer the amount deducted to the institution which has paid undue sums. If the deadline expires, that institution shall without delay pay out the arrears to the person concerned.