Hello Arjun,
Please correct me if my interpretation of your question is wrong. You would like to know the Confirmation Number and the Cancellation Number posted for a particular PO.
If that is the case then it is possible to get the details using the FM BBP_PD_PO_GETDETAIL or else you can find the information related to the Confirmation in the table BBP_PDCON.
Regards
Pramod