(56)With the exception of the internal audit function, it should be possible for a single person or organisational unit to carry out more than one key function. However, the person or organisational unit performing a key function should be different from the one performing a similar key function in the sponsoring undertaking. Member States should be able to allow the IORP to carry out key functions through the same single person or organisational unit as the sponsoring undertaking, provided that the IORP explains how it prevents or manages any conflict of interest with the sponsoring undertaking.