Diagnosis
If you call up this report to execute data reconciliation cashmanagement, then it is recommended to execute the data reconciliationvia the cash management implementation tool (Transaction 'FDFD')as itsoutput is much more user-friendly.
This transaction is in the Customizing implementation guide (IMG)

• Cashmanagement -> Tools -> Prepare live Date and data setup

The documentation on this IMG activity is available there
Choose the function 'Data reconciliation'. Please note that whenentering a comparison period, bank accounts (not G/L accounts managedby OIs) can not be reconciled.