QB Issue Resolution:

Calculating Sales Rep commission’s on customer payments not on total sales would require a report that displays the Sales Rep name and payments.

The Sales by Rep report only shows totals of the Invoices and Sales Receipts and does not show when or if the Invoices were paid.
Solution Description

Open the Sales by Rep report and Modify it so that it displays in Cash basis.

Go to the Reports menu.
Choose Sales > Sales by Rep.
Click the Modify Report button in the upper left and choose Cash from the Report Basis section.
Click OK to close the Modify Report window.
The report now has added the Paid Amount column. This amount is the amount of the payment to each invoice.
The Date column displays the payment date so you can filter the report on the payments received during a selected period of time.

Resolution for Issue 'Calculate Sales Rep Commissions on Current Customer Payments' available: Yes (Solved).
Source: Intuit Community forum.

Calculate Sales Rep Commissions on Current Customer Payments: 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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