In order to ensure progressive convergence between the level of own funds and the prudential adjustments applied to the definition of own funds across the Union and to the definition of own funds laid down in this Regulation during a transitionaltransition period, the phasing in of the own funds requirements of this Regulation should occur gradually. It is vital to ensure that this phasing in is consistent with the recent enhancements made by Member States to the required levels of own funds and to the definition of own funds in place in the Member States. To that end, during the transitionaltransition period the competent authorities should determine within defined lower and upper limits how rapidly to introduce the required level of own funds and prudential adjustments laid down in this Regulation.