Change Source of Supply determination during PPDS Planning Heuristic

Hi APO Gurus,

We are running PPDS for our Production Planning. In the PPDS run, when we have more than one source of Supply , system selects the Source of Supply based on Lot Size, Validity , Priority or Quota.

In our scenario, we want to change the Source of Supply selection criterion based upon our own logic. So, while executing the PPDS run, i am unable to find out any BADI or Exit is available or not which will do this job.

If anyone has worked in this before or any suggestation will be appreciated.

thanks,

Priya