Linking Sales order to Purchase Order (PRs created from Planning)

Hi Gurus,

   We have a requirement to establish a link between a sales orders to all the supplies that are created for meeting the demand. For certain types of sales orders, we will have to link the salesorder to all the supplies that has been created for meeting up the demand. We have FIFO pegging and Lot for Lot enabled in plan options. So we would assume a single supply is created for a single sales order demand.

  

   We are planning to use pegging from planning.  

  

   I would want to understand how to identify all the supplies created for a particular SO demand in ASCP.