QB Issue Resolution:

Estimates are called Non-Posting and are Planning tools. These are neither paid or not paid and nothing is owed from them.

You must have applied payments to Invoices.

Go to the customer center. Find that customer’s payment and Open it. Unlink it from what you applied it to, right here. Apply to some other open charge, or not. Save and Close.

Is that Invoice also a problem? If so, use that same Customer Center, transactions list, to find that invoice and Open it on screen. Delete it, if it is created from the Wrong Estimate. Make the Right Invoice, using the same info such as Date, invoice #, etc. Save.

Then go back to that payment and Open it, and apply it to the New invoice.

Resolution for Issue 'How do I correct payments applied to wrong estimates' available: Yes (Solved).
Source: Intuit Community forum.

How do I correct payments applied to wrong estimates: 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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