On the PIDs tab, look at the right-hand column, it is titled "Parameter", click on the title (the word "Parameter") to sort alphabetically on that column...
then look down that column until you see the pids CALC.BEN_PLX1 and CALC.BEN_PLX2...
the BEN pids are the correction multiplier, to see their definition do rightclick->More Info on each of them (on the PIDs tab).
Summary: the AFR pids convert voltage to AFR; the BEN pids calculate the correction multiplier (to apply to your VE or MAF tables).