EBU Single Rulebook Q&A 14 August 2013 2013_163 Treatment of commodity indices

Must exposures to commodity indices be broken down into its underlying constituent commodities or can a commodity index be treated as if it were an individual commodity, just like stock indices (see Article 344 of Regulation (EU) No. 575/2013 (CRR))? Article 344 states that stock index futures can be treated as if a future were an individual equity.