Hi,
Why FMB_PL01? It's a report to compare actuals for PBET. To look at totals, you can use any standard report of BCS, e.g. FMRP_RW_BUDGET or FMRP_RW_BUDCON. However, even FMB_PL01 is supposed to show the documents for carry-over: you should be able to distinguish these documents by 'Process'.
Regards,
Eli