(16)Pursuant to Article 77b(1), point (b), of Directive 2009/138/EC, insurance and reinsurance undertakings that use the matching adjustment have to identify, organise and manage the assigned portfolio of assets and obligations separately from other parts of the business and are therefore not permitted to meet risks arising elsewhere in the business using the assigned portfolio of assets. However, the separated management of the portfolio does not result in an increase in correlation between the risks within that portfolio and those within the rest of the undertaking. Therefore, insurance and reinsurance undertakings which use the matching adjustment should not be required to calculate a distinct notional solvency capital requirement for the portfolio of assets and obligations to which the matching adjustment is applied, unless the portfolios of assets covering a corresponding best estimate of insurance or reinsurance obligations form a ring-fenced fund.