It is also important to note that although there are established approaches to estimate a credit rating for a particular group member or debt issuance, the considerations detailed above mean that a pricing approach based on the separate entity credit ratings that are derived from publicly available financial tools (see paragraph 10.72), the implicit support analysis, the difficulties of accounting for controlled transactions reliably and the presence of information asymmetry may pose challenges that, if not resolved, may result in outcomes that are not reliable ...