(63)When implementing the initial Basel III standards on the treatment of CVA risk in Union law, certain transactions were exempted from the calculation of the own funds requirements for CVA risk. Those exemptions were agreed in order to prevent a potentially excessive increase in the cost of some derivative transactions triggered by the introduction of the own funds requirements for CVA risk, particularly when institutions could not mitigate the CVA risk of certain clients that were unable to exchange collateral. According to the estimated impact calculated by EBA, the own funds requirements for CVA risk under the revised Basel III standards would remain unduly high for exempted transactions with those clients. To ensure that those clients continue hedging their financial risks via derivative transactions, the exemptions should be maintained when implementing the revised Basel III standards.