(a) In a typical synthetic securitisation, the "super-senior" tranche would be treated as a senior tranche, provided that all of the conditions for inferring a rating from a lower tranche are fulfilled;

(b) In a traditional securitisation where all tranches above the first-loss piece are rated, the most highly rated position would be treated as a senior tranche. However, when there are several tranches that share the same rating, only the most senior one in the waterfall would be treated as senior; and

(c) Usually a liquidity facility supporting an ABCP programme would not be the most senior position within the programme; the commercial paper, which benefits from the liquidity support, typically would be the most senior position. However, if the liquidity facility is sized to cover all of the outstanding commercial paper, it can be viewed as covering all losses on the underlying receivables pool that exceed the amount of over-collateralisation/reserves provided by the seller and as being most senior. As a result, the RBA risk weights in the left-most column can be used for such positions. On the other hand, if a liquidity or credit enhancement facility constituted a mezzanine position in economic substance rather than a senior position in the underlying pool, then the "Base risk weights" column is applicable.