In the case of senior unfunded credit protection, where risk-weighted exposure amounts of the securitisation position being subject to the credit protection are calculated using the Ratings Based Method, according to the rules set out in Article 264(1) institutions may amend the exposure value or the risk weight for such a securitisation position in accordance with the provisions of Part Three Chapter 4 as they apply for the calculation of risk weighted exposure amounts under Part Three Chapter 2. According to Article 234, which is the only Article addressing cases of tranched protection within Part Three Chapter 4, the rules set out in Part Three Chapter 5 shall apply in the event of partial protection and tranching. As the securitisation rules are in this case applied to a securitisation exposure, the question arises whether re-securitisation rules are applicable when the risk weighted exposure amounts of the portions covered and uncovered by the unfunded credit protection are determined. Assuming that an underlying pool of exposures may include only one exposure in accordance with paragraph 542 of the Basel Framework, the covered and uncovered portions of the securitisation could fall under the special treatment for re-securitisation positions as the covered and uncovered portions could both be regarded as an exposure to a securitisation where the risk associated with an underlying pool of exposures is tranched and at least one of the underlying exposures (the protected securitisation position) is a securitisation position. However, treating the portions covered and uncovered by the tranched credit protection as re-securitisation positions does not seem appropriate for the reason that Article 264 as lex specialis also sets out rules regarding the case of tranched protection of a single securitisation position which would be redundant if such tranched protection would generally result in the credit protection being directly regarded as a re-securitisation according to Article 4(63).