The substitution of a unit of account for units of account of a comparable nature, as provided for in article R. 131-4 , is authorised by the Autorité de contrôle prudentiel et de résolution on the basis of a report by an expert appointed by the insurer. The expert certifies the comparability of the companies, with regard to the criteria of use – residential, offices, shopping centres – and the location of their assets.
However, the authority may also request that an expert report be drawn up in accordance with the procedures set out in article A. 343-2-1.