Hi Jing,
Did you reverse an AP check or a Deposit/Receipt?
If this was an AP check, after you have posted the Reversal in Bank Rec, you still have to go into AP and Reverse the check there using the Check Reconciliation function. You may find that the reconciliation status has already been set to O->R and all you have to do is click Post - this will be the case if you defined the Bank in BankRec to 'set pending status in AP'.
There is a clearing account between BankRec and AP whenever a transaction (check) goes from one program to the other. If that clearing account is ever non-zero, it means you have done something witha check in one application and not retrieved and done the same in the other application.
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Regards,
Softrak Tech Support