25. Where a retirement pension reduced in accordance with this Division is not paid pursuant to the provisions of the Regulation respecting transitional measures necessary for the application of the Act concerning the organization of police services (O.C. 495-2003, 03-03-31) and the retired member is entitled to receive a retirement pension recalculated pursuant to those provisions, that recalculated retirement pension is reduced, from the date on which it becomes payable, by the amount of pension that was used to reduce the retirement pension. That amount of pension is indexed in the same manner as the retirement pension would have been indexed if its payment had not stopped from 1 January following the date on which that amount began to apply to 1 January of the year in which the recalculated retirement pension becomes payable.