T is measured as the ratio of (a) the nominal size of the tranche of interest to (b) the notional amount of exposures in the pool. In the case of an exposure arising from an interest rate or currency swap, the bank must incorporate potential future exposure. If the current value of the instrument is non-negative, the exposure size should be measured by the current value plus the add-on as in the previous capital adequacy regulations issued by CBB dated July 2004. If the current value is negative, the exposure should be measured by applying the potential future exposure only.