Reversal of Manual BRS entries

Hi

We have Cash Management System. Where all the checks deposited (by customer) in bank is credit to my account on next day irrespective of the bank clearing or not (as per RBI). If check is bounced it will be debited after 2-3 days when bank clearing is done.

Now we do FF67 (manual BRS). When i posted bank receipt from customer,

Entry Posted:

Incoming Bank A/c.. Dr

To customer A/c

When FF67 is done:

Main Bank A/c... Dr

To Incoming bank account.

In FF67, above entry clears the incoming bank account line item

Now when i come to know that check is actually bounced and again debited in my account, i want to reverse above entry (i.e. 2nd entry - FF67).

So i want that FF67 should be able to reverse the above (already cleared entry).

So please let me know if its possible to reset and reverse the particular accounting entry in BRS (FF67).