In Annex C, table 53 in the last column there are two entries saying
"SPLIT in setup time (AUST) and value added production time (APT=PQ*RPI) as retrograde confirmation (backflush) "

and note 3 says:
Note 3: If an added value activity is included in setup mode period, then the added value time has to be calculated as APT (APT=PQ*RPI) based on produced quantities and AUST has to be reduced based on this calculated APT.

This should likely say "PRI" (planned runtime per item) instead of RPI in both instances to use the terminology of ISO 22400.