Hi senthil ,
Check the below 2 reports For a detailed report you may need to contact a BI person or post in the BI forum .
1. BBP_IV_UPDATE_PAYMENT_STATUS :You can use this report to synchronize the status of invoices in SAP SRM with the status in the back-end system. If an invoice in the back-end system has the status Paid, the status in SAP SRM is adjusted; that is, the status changes from Approved to Paid.
Note that invoices in SAP SRM with the status Paid cannot be canceled.
2.BBP_IV_AUTO_COMPLETE: This report checks for XML invoices with the status Waiting for Preceding Document, and whether appropriate documents have been posted in the meantime, and then attempts to post the relevant invoice.
3. BBP_PD_INV_GETLIST FM
4. Use function module BBP_BE_PO_GETHISTORY and pass PO number (I_OBJECT_ID) and logical system (I_LOG_SYSTEM) and E_ITEM_HISTORY table will give you invoice number try BBP_PD_PO_DOC_FLOW with the PO number
5. You may also choose to implement IMS
http://help.sap.com/saphelp_srm50/helpdata/en/42/dc00a78d23162fe10000000a1553f7/frameset.htm
6. Other Post https://scn.sap.com/thread/1221054