Article 149

1.  An institution that uses the IRB Approach for a particular exposure class or type of exposure shall not stop using that approach and use instead the Standardised Approach for the calculation of risk-weighted exposure amounts unless the following conditions are met:

(a)    the institution has demonstrated to the satisfaction of the competent authority that the use of the Standardised Approach is not proposed in order to reduce the own funds requirement of the institution, is necessary on the basis of nature and complexity of the institution's total exposures of this type and would not have a material adverse impact on the solvency of the institution or its ability to manage risk effectively;

(b)    the institution has received the prior permission of the competent authority.

2.  Institutions which have obtained permission under Article 151(9) to use own estimates of LGDs and conversion factors, shall not revert to the use of LGD values and conversion factors referred to in Article 151(8) unless the following conditions are met:

(a)    the institution has demonstrated to the satisfaction of the competent authority that the use of LGDs and conversion factors laid down in Article 151(8) for a certain exposure class or type of exposure is not proposed in order to reduce the own funds requirement of the institution, is necessary on the basis of nature and complexity of the institution's total exposures of this type and would not have a material adverse impact on the solvency of the institution or its ability to manage risk effectively;

(b)    the institution has received the prior permission of the competent authority.

3.  The application of paragraphs 1 and 2 is subject to the conditions for rolling out the IRB Approach determined by the competent authorities in accordance with Article 148 and the permission for permanent partial use referred to in Article 150.