Checking and Restoring Previous External Reconciliations 
Incorrect external reconciliations are rare cases of reconciliations where the amounts on the debit and on the credit side do not match.
You can display and cancel only incorrect external reconciliations or all the external reconciliations initiated by users and by SAP Business One for a specific G/L account or business partner.
Note
If bank statement processing is activated in SAP Business One, you must perform external reconciliations directly within the bank statement processing functionality. Do not use this function to reconcile transactions from your bank statements. For more information, see the online help for SAP Business One and How to Use Bank Statement Processing in Release 2007 in the documentation area of SAP Business One Customer Portal at http://service.sap.com/smb/sbocustomer/documentation.
Note
If bank statement processing is activated in SAP Business One, bank transactions recorded in bank statement processing are not displayed in the Check and Restore Previous External Reconciliations window.
Procedure
Note
This action cannot be reversed.
From the SAP Business One Main Menu, choose
Banking 
Bank Statements and External Reconciliations Check and Restore Previous External Reconciliations
.In the Check and Restore Previous External Reconciliations window, specify the selection criteria and choose the Execute button.
Reconciliations for the selected account or partner are displayed in the table.
Do one of the following:
To cancel all reconciliations displayed in the table, choose the Open All button.
To cancel only incorrect reconciliations, choose the Open Incorrect Only button.
CautionOnce you choose the Open All button or the Open Incorrect Only button, you cannot undo the cancellation.
End of the caution.