EBU Single Rulebook Q&A 13 January 2016 2016_2559 Classification of exposures for which an IRB bank uses the standardised approach, into IRB exposure classes (Article 147 CRR)

Is there any regulation stipulating that for exposures where an IRB bank uses the standardised approach, these "standardised" exposures have to be classified into exposure classes valid for the standardised approach (Article 112 Regulation (EU) No 575/2013 (CRR)).