When it is not practical for the bank to use either the bottom-up approach or the top-down approach for calculating K_IRB, the bank may, on an exceptional basis and subject to CBB consent, temporarily be allowed to apply the following method. If the liquidity facility meets the definition in paragraph CA-6.4.19 or CA-6.4.22, the highest risk weight assigned under the standardised approach to any of the underlying individual exposures covered by the liquidity facility can be applied to the liquidity facility. If the liquidity facility meets the definition in paragraph CA-6.4.19, the CCF must be 50% for a facility with an original maturity of one year or less, or 100% if the facility has an original maturity of more than one year. If the liquidity facility meets the definition in paragraph CA-6.4.22, the CCF must be 20%. In all other cases, the notional amount of the liquidity facility must be deducted.