Provisional calculation of benefits and contributions

1.   Unless otherwise provided for in the implementing Regulation, where a person is eligible for a benefit, or is liable to pay a contribution in accordance with the basic Regulation, and the competent institution does not have all the information concerning the situation in another Member State which is necessary to calculate definitively the amount of that benefit or contribution, that institution shall, on request of the person concerned, award this benefit or calculate this contribution on a provisional basis, if such a calculation is possible on the basis of the information at the disposal of that institution.
2.   The benefit or the contribution concerned shall be recalculated once all the necessary supporting evidence or documents are provided to the institution concerned.