Dear VIV,
Please reverse the list of document which were posted in the system.
1. if you are failing to reverse the document, your SAP main bank account and bank account will not reconcile correctly.
2. If any open item AR/AP might have been cleared, for which we would have not done the actual payment or receipt.
As per best practise we should reverse the document posted document before deleting the bank statement.
You can see the list of posted document via TCODE- FEBA, or check table FEBKO.
Regards,
M S Lokesh