(156)For the purpose of ensuring the appropriate and efficient administration of justice during the period between the entry into force and application of this Regulation, and in order to allow for its smooth interaction with national procedural law, information and documents pertinent to ongoing legal proceedings for the purpose of the prevention, detection or investigation of possible money laundering or terrorist financing, where those proceedings are pending in the Member States on the date of entry into force of this Regulation, should be retained for a period of 5 years after that date, and it should be possible to extend that period for a further 5 years.