Glad to see you here, @batvalil.

I'm here to help walk you through clearing out your customer's old balance in the system. Let's get started!

To start with, let's create a general journal entry to write off your accounts receivables. Here's how:

1. Create the appropriate journal entry.
   1. Go to the Company menu.
   2. Choose Make General Journal Entries.
   3. In the Make General Journal Entries window, change the date and fill in the entry number if necessary.
      1. Go to the Account field.
      2. Select Accounts Receivable.
      3. Enter the amount under Debit column.
      4. Choose a Customer Name from the drop down list.
      5. In the next line, select the offset account.
      6. Type in the amount under Credit column.
2. Apply the General Journal Entry to the Existing Credit.
   1. Click the Customers.
   2. Choose Receive Payments.
   3. Enter the name of the customer in Received From field.
   4. Select the invoice and choose Discounts & Credits.
   5. Under Credits tab, select the available credit.
   6. Click Done.
   7. Select Save & Close.

That should do it!

If you need further help with the steps above, I'd recommend contacting our Customer Care Team. A specialist will be able to access your account in a secured environment and further assist you via remote access session.

Here's how to contact us:

1. Visit: https://help.quickbooks.intuit.com/en_US/contact.
2. Choose your QuickBooks Product.
3. Select your QuickBooks Version.
4. On the Contact Us page, click a topic.
5. Click on the Get Phone Number button to see the support number.

Feel free to drop a comment below if you have other questions about writing off your customer's balance. I'm always here to lend a hand.