(4)While for extensions and changes to AMA approaches, the quantitative threshold should be calculated, for the sake of simplicity, on the basis of the own funds requirements, for changes to the IRB approaches the threshold should be calculated on the basis of risk-weighted exposure amounts, in order to avoid that the thresholds are unduly influenced by differences in the amounts of credit value adjustments made, which affect own funds requirements, but not risk-weighted exposure amounts. Moreover, quantitative thresholds should be designed to take into account the overall impact of the extensions or changes on the capital required based on the internal approaches as well as the standardised approaches, in order to reflect the extent to which internal approaches are used for the overall own funds requirements or risk-weighted exposure amounts. This applies to all thresholds for both approaches, except in relation to the second threshold in Article 4(1)(c)(ii) for the IRB approach and the prior notification threshold for the IRB approach which are designed with regard to the impact of changes on the risk-weighted exposure amounts covered by the range of application of a specific model. For both the IRB approach and the AMA, the calculations to derive the impact of a given extension or change should be made with reference to the same point in time, given that the set of exposures (in the case of the IRB approach) and the risk profile (in the case of the AMA) are relatively stable in time.