A conventional bank licensee is not permitted to use any external credit assessment for risk-weighting purposes where the assessment is at least partly based on unfunded support provided by the conventional bank licensee. For example, if a conventional bank licensee buys ABCP where it provides an unfunded securitisation exposure extended to the ABCP programme (e.g. liquidity facility or credit enhancement), and that exposure plays a role in determining the credit assessment on the ABCP, the conventional bank licensee must treat the ABCP as if it were not rated. The conventional bank licensee must continue to hold capital against the other securitisation exposures it provides (e.g. against the liquidity facility and/or credit enhancement). The treatment described above is also applicable to exposures held in the trading book. A conventional bank licensee's capital requirement for such exposures held in the trading book can be no less than the amount required under the banking book treatment.