Manage Rebate Agreement Final Settlement based on Total Customer Sales Amount

Good Morning Everyone, 

Our customer wants to manage rebate agreement final settlement based on a “min.sales” expressed in terms of amount of sales per currency, not based on UoM of the Sales Part.

Would you know how I can manage that in IFS? 

We are on IFS Aurena version: 22.2.1.20221024062126.0