I appreciate you bringing this to our attention and for the detailed inputs when clearing out customer invoice balances in your account, SB719. Let's ensure the sales entries recorded in your file show the correct balances so your books stay accurate. 

In QuickBooks, applying credit memos to customer invoices will effectively zero out the balances on your customer sales transactions. This process helps ensure that your accounts receivable and net income are always correct. 

Since deleting and recreating the original credit memo and applying them to the invoice using the receive payment feature still shows the customer's balance in your account, unusual behaviors like this must have caused data damage to your company file. Let's first ensure your QuickBooks Desktop file is up-to-date to have your data on its latest product improvements. Then, let's verify and rebuild your data to identify company file errors.  To do this:

1. On the top menu, click File and select Utilities.
2. Click on Verify Data.
3. Select OK when QuickBooks doesn't detect any problem with your data.
4. If Verify finds an issue with your data, you'll be prompted to Rebuild Now or View Errors.
5. Click Close or View Errors and take note of the specific error message.

Then, here's how to rebuild data:

1. Go to File and click Utilities.
2. Click OK if you receive a prompt to back up your company file.
3. Select OK when the rebuild is complete.
4. You can run the Rebuild Data again to ensure there's no error.

However, if the issue persists after troubleshooting your file, it's best to reach out to our Customer Care Team to have your account reviewed and verify the transactions created.

You can also utilize this reference for any additional fixes to help resolve data issues in your file: Fix data damage on your QuickBooks Desktop company file.

Once everything comes in handy in the future, you can run specific reports to help review your business finances. Then, start reconciling your account so they match your bank and credit card statements

I'll leave this thread available so you can always reply below for any additional queries when managing customer sales transactions in your account. Just let me know anytime you need help. Keep safe.