(20)The outsourcing of investment services or activities or critical and important functions is capable of constituting a material change of the conditions for the authorisation of the investment firm, as referred to in Article 16(2) of Directive 2004/39/EC. If such outsourcing arrangements are to be put in place after the investment firm has obtained an authorisation according to the provisions included in Chapter I of Title II of Directive 2004/39/EC, those arrangements should be notified to the competent authority where required by Article 16(2) of Directive 2004/39/EC.