QB Issue Resolution:

Let’s see if we can find your elusive credits. Go to Customer tab and Receive Payment. Enter customer name – of course you see alll outstanding invoices. At the bottom of the screen should be a “This customer has x available credits . Now, to apply credits click on date or number field in an invoice, not the checkbox – this selects that invoice. Now at top of screen is a green Discounts tab. Click on it and select the credit and any lesser amount to apply – or click the auto-apply button instead and all available credits for that customer will be applied starting with oldest invoice first.

Resolution for Issue 'How to apply an over payment to another invoice?' available: Yes (Solved).
Source: Intuit Community forum.

How to apply an over payment to another invoice?: 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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