QB Issue Resolution:

Use receive payments, select the invoice and enter the actual amount paid

QB will ask if you want to keep the over payment as a credit, or refund it

Resolution for Issue 'Customer overpaid – how do I carry over the balance?' available: Yes (Solved).
Source: Intuit Community forum.

Customer overpaid – how do I carry over the balance?: 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
Quickbooks Repair Pro will resolve it efficiently and affordably. Guaranteed resolution of your issue, or you pay nothing!

Error Recovery for credit [Canada]
E-Tech is the #1 Quickbooks data migration and Conversion service provider.

Get 50% off Quickbooks Online

Click Here for 50% off!

Additional Support Options: