QB Issue Resolution:

Run the sales by customer report, calculate the amount of the rebate per customer, or export the report to excel and let excel calculate it.

Write a check the customer for the amount and use a rebate expense account, or issue a customer credit to be used later in that amount using a non inventory item linked to the same expense account

Resolution for Issue 'How do i enter sales rebate to a customer for their purchase? Rebate based on monthly sales' available: Yes (Solved).
Source: Intuit Community forum.

How do i enter sales rebate to a customer for their purchase? Rebate based on monthly sales: 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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