EBU Single Rulebook Q&A 18 August 2017 2017_3479 International Organisations allocated to the 'Institutions' exposure class

Could you please advise based on which criteria are International Organizations allocated to the “Institutions” exposure class under IRB Approach. As per EBA/ITS/2017/01, Annex II, C 33.00, paragraph 6.3, instructions on row 150 refer to Article 147(4)(a) of CRR and as specified by the instructions for template C 08.01 and C 08.02.