I want to know, how to configure discounts in vendor bills. I have a scenario, where the purchase order is issued to the vendor, however, due to quality issues, the payment will be made less than the value of the purchase order issued. For example per unit rate was 10 in the initial PO, however, the bill will be made after the discount at 9.5 per unit.

I want to know, how to add a discount in the purchase bill and how to configure the discount percentage or value.