Customer Clearing on Electronic Bank Statement

Hi,

I am facing a problem to clear the customer open items.

Let me explain the situation.

The is an invoice on the Customer Account. The entry is:

Customer A/c Dr. 100

Sales A/c Cr 100

Now, I have received a bank statement, when I posted the receipt. When I posted electronic bank statement, the entry the system is going to post is:

Bank Main Account Dr. 100

Bank Sub Account Cr. 100

There is still a debit lying in the Customer and there is a credit lying in the Bank Sub Account. How can I clear these two accounts with each other.

Any valid inputs will be highly appreciated.

Thanks in advance.

Regards,

Ravi