Revised Article 152(4) CRR dealing with the look-through treatment of exposures in the form of units or shares of CIU under the IRB approach requires institutions to apply the standardised approach to the underlying credit exposures when the conditions for permanent partial use are met for these exposures or when the conditions of Chapter 3 CRR are not met. For a given underlying credit exposure, institutions may be authorized to use the IRB advanced approach as if they were directly held by the institution, in accordance with Chapter 3 CRR. When this exposure is effectively booked on its balance sheet, the institution should thereby be in possession of all the information and data that are used in the PD/LGD homologated models as well as the relevant information and data required for the back-testing of these models. When looking-through CIU units or shares, the underlying obligor may not be internally rated since not part of the institution’s credit portfolio. Moreover, because the turnover of the fund’s assets is generally high, the details of the underlying portfolio is generally known after the reporting cut-off date and the timing for the application of the look-through at each reporting date may not be compatible with an internal rating validation process. Then, even if the institution has been able to rate the obligor or if the obligor was already rated, the data and information related to such an exposure and required to estimate and back-test own LGDs of the applicable model may not always be exhaustively available to the institution. In particular, the realised losses given default if any will be observed by the CIU and not be necessarily communicated to the institution. Moreover, it is rather likely that funds will sell the exposure before its default (for instance, following a credit deterioration) and thus observe very few defaults and realized LGD. It thus seems that it may not always be possible for institutions to meet all the conditions for using the model relevant to a given underlying exposure in accordance with the Article 181 CRR and EBA (Guidelines on PD estimation, LGD estimation and treatment of defaulted exposures, e.g. Article 107) requirements for the purpose of own LGD estimation through this model. It is noteworthy that a CRDTG Q&A (question 173) already addressed a similar questioning under the Basel II environment for the application of CRDII Article 87.11) that allowed for the look-through approach on CIU units or shares when certain criteria were met. It was stated that “under the look through approach risk weights must be calculated according to the underlying exposures. Effectively, this means treating the underlying exposures as direct exposures of the institution. If underlying exposures belong to a type of exposures for which the institution has approval to apply the IRB approach by using an internal rating system, the first part of Article 87(11) requires the application of the internal rating system for those underlying exposures. Underlying exposures that belong to the type of exposures for which the institution, as part of its approved IRB approach, is allowed to use the Standardised approach (according to Article 85 ‘roll out’ and 89 ‘partial use’) are risk-weighted according to the Standardised approach. However, it should be noted that in such situations, these underlying exposures must also be taken into account when assessing compliance with the ‘partial use’ and/or ‘roll out’ limits. If underlying exposures are not treated under any partial use or roll out exemption, but the institution is unable to assign an internal rating to the exposure because the conditions to use the internal rating system are not met (for example due to a lack of information on the relevant risk drivers of the underlying exposures) Article 87(11), second sub-paragraph shall apply.”