(4)To ensure prudent calculation of own funds requirements, other considerations should also be taken into account by competent authorities when assessing requests for data waiver permissions. Specifically, institutions requesting permission for the use of shorter data series should apply an appropriate margin of conservatism. Moreover, institutions should prove to the satisfaction of the competent authorities the lack of accurate, complete or appropriate longer time series of data. Given that the impact on own funds requirements may be higher as a consequence of inaccurate data, institutions should also employ additional data quality validation procedures commensurate with the smaller sample size.