If the calculation of the amount of an exposure or of a combination of exposures under BIPRU 13 would materially understate the amount of the counterparty credit risk the firm must increase the amount of the credit risk capital requirement by an amount sufficient to compensate for that understatement.
has an exposure of a non-standard type; or
an exposure that is part of a non-standard arrangement; or
it must notify the appropriate regulator as soon as practicable of that fact, the counterparty involved, the nature of the exposure or arrangement and the treatment of those exposures it has adopted for the purpose of the calculation of the credit risk capital requirement.
The methodologies which have been developed assume instruments with standard characteristics. There are many examples, however, of instruments which, although based on a standard contract, contain structural features which make the rules, as stated, inappropriate. In such circumstances a firm should consult the appropriate regulator.