(5)In order to avoid overreliance on ratings when the exposures are to another insurance or reinsurance undertaking, the use of ratings for the purposes of calculating the capital requirement in accordance with the standard formula could be replaced by a reference to the solvency position of the counterparty (solvency ratio approach). Such an approach would necessitate a calibration based on Solvency Capital Requirements and eligible amounts of own funds to cover these Solvency Capital Requirements as determined when Solvency II is in place. The solvency ratio approach should be limited to insurance and reinsurance undertakings that are not rated.