TMS320F28P550SJ: Max number of ADC channels for HW oversampling concurrently

Tool/software:

Hi Champs

i’m asking this for our customer. 
What is the max number of ADC channels using PPB oversampling that we can support concurrently?

There are 5 ADC modules. 
Each ADC module has 4 PPB submodules. 
That is, P55x can support up to 20 (=5x4) ADC channels using PPB for oversampling concurrently. 

is our understanding correct?