ELIMINATION OF REVERSE ENTRY

Dear Gurus,

Please tell me how to eliminate the reverse entries from the reports. For example:

If i had done a wrong entry for customer invoice & post that. Now the customer debit balance is showing Rs. 100000. Later on I want to reverse that. But after reversing the entry the amount is still there. Whenever my users are going for the reports they don't want that amount, which is a wrong entry. they are finding the difference in customer Report & Sales register.

Please help me out.

Satya.