64It is in fact settled case-law that, where rules fall within the scope of measures of internal organisation of the Parliament, those rules come within the scope of the Parliament’s competence and the measures which it is for the Parliament to adopt pursuant to the first paragraph of Article 199 EC (see, to that effect, Bruce of Donington, cited in paragraph 60 above, paragraph 15). As has just been set out above, the establishment and, as the case may be, the amendment of the additional pension scheme must be regarded as measures of internal organisation intended to ensure the proper functioning of the Parliament. It must be pointed out in this regard that the Rules of 12 June 1990 form part of the PEAM Rules, adopted by the Bureau on the basis of Rule 22(2) of the Rules of Procedure of the Parliament in the version applicable to the facts of the case, which authorises the Bureau inter alia to take financial, organisational and administrative decisions on matters concerning Members (see paragraphs 1 to 3 above). In turn, the Rules of Procedure were adopted on the basis of the first paragraph of Article 199 EC, which provides that the Parliament is to adopt its Rules of Procedure. Accordingly, the argument advanced by the applicant alleging a lack of competence on the part of the Bureau to adopt the decision of 1 April 2009 cannot succeed.