Dear Ashwani,
FPG2 do reconciliation between General Ledger (FI-GL) and Contract Accounts Receivable and Payable (FI-CA). To do this, it compares the transferred FI-CA totals records with the documents posted in the general ledger during the transfer.
So, problem is mismatch of any field between this above.
The reconciliation items concerned have a red light shows there are differences. Differences may occur for all amount fields, that is, even for those that are not displayed on that initial screen. So do one thing- at “Detailed Display Reconciliation”, select change lay out and make display all columns. Then check which column field contains that difference between FI-CA total records with GL document.
Regarding one more your concern regarding FPG1, first of all check that is there anything table updation going on system regarding that issue field? As in most of the FPG2 difference cases, main problem is of table updation after reconciliation key transfer either FICA total records header table (DFKKSUM) or at FI-GL table.
Regards,
Akhil Vaghasiya