QB Issue Resolution:

ou can check the audit log to get the details of the invoice.  Then, go in and re-create it.  If there was a payment attached to it before it was deleted, that payment is now showing as un-applied.

 

Go into receive payments and you should see an unapplied payment from your customer.  Apply that payment to the invoice.

Resolution for Issue 'I accidentally deleted an invoice' available: Yes (Solved).
Source: Intuit Community forum.

I accidentally deleted an 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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