The institutions shall make back-payments in the event of an increase in remuneration as a result of the weightings shown in the Annex.

The institutions shall make retrospective downward adjustments to remuneration in the event of a reduction as a result of the weightings shown in the Annex for the period between 1 July 2010 and 29 September 2011.

Retrospective adjustments involving the recovery of sums overpaid shall be restricted to a period of no more than 6 months preceding 29 September 2011. Recovery shall be spread over a period of no more than 12 months from that date.