(6)To ensure the correct measurement and coverage of all the risks which are referred to in Parts Three and Four of Regulation (EU) 2019/2033 but not fully or adequately covered by those requirements, such risks should be measured separately for each risk category (Risk-to-Client, Risk-to-Market and Risk-to-Firm). For the same reason, the risks not covered in Parts Three and Four of that Regulation, including those explicitly excluded from those requirements, should be measured on a risk-by-risk basis. However, if the measurement per risk category or on a risk-by-risk basis is overly burdensome or is not feasible in cases of investment firms subject to an initial capital requirement lower than the requirement laid down in Article 9(1) of Directive (EU) 2019/2034, the measurement of risks should in those cases be performed on an aggregate level, taking into account the principle of proportionality.