Q: Is there any possibility to filter only the PRCA records created by supplier(s) in SCOT?

A: Yes, this is possible. You have to go to the "Search Proactive RCA" section of the PRCA tab and select "Supplier Created Cases" from the drop down menu of the "Config Type" field:

NOTE: You can also select Supplier's name if you want to see PRCA created by a particular supplier.