QB Issue Resolution:

If you have customer credits as a result of over payments you have two choices

 

refund the amount
or

sell a service item for that amount and apply the credit to pay it, clearing the credit

Resolution for Issue 'I’m doing some clean up work for a client with open invoices from some years ago. Partial paid with small over paid balance. Suggestions?' available: Yes (Solved).
Source: Intuit Community forum.

I’m doing some clean up work for a client with open invoices from some years ago. Partial paid with small over paid balance. Suggestions?: 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.

Support for credit
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Error Recovery for credit [Canada]
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