QB Issue Resolution:

Customers with zero balances on AR Aging reports show when there are transactions not linked like an Invoice to the Payment or Credit. They show not because they have no balances but they have open transactions. You may have to view the Customer Open Balance report to view and link these transactions to close them out.

Here’s a useful link: http://support.quickbooks.intuit.com/support/Articles/SLN40686

Resolution for Issue 'How do I get rid of zero balances in the AR aging?' available: Yes (Solved).
Source: Intuit Community forum.

How do I get rid of zero balances in the AR aging?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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