(3)In some cases, it is possible that, due to the nature of an adjustment and due to the internal risk management applicable to that adjustment, such adjustment is computed across sets of positions that are assigned to more than one trading desks. To ensure harmonisation across the Union, institutions should be required, when calculating the actual and hypothetical changes in a trading desk’s portfolio value, to either recalculate such adjustment for each trading desk on the stand-alone basis of the positions assigned to the trading desk only, or, where specific conditions are met, to reflect the changes arising from such adjustment only in the context of the back-testing referred to in Article 325bf(6) of Regulation (EU) No 575/2013. Accordingly, where institutions perform the end-of-day valuation process to derive the trading desks’ end-of-day portfolio values, they should not be allowed, when calculating hypothetical and actual changes at the trading desk level, to allocate the adjustment to the trading desks in a manner that is proportionate to each trading desks’ contribution to the value of the adjustment.