QB Issue Resolution:

Run your P&L report & then double click on the amount. That should bring up the transaction that created it. If not, the double click on the amount in the list until the transaction displays.

Resolution for Issue 'Unapplied Cash Payment Income' available: Yes (Solved).
Source: Intuit Community forum.

Unapplied Cash Payment Income: 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 Income
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Error Recovery for Income [Canada]
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