Fixed discount rule applied incorrectly when Include Fixed Amount ticked
Description
If a Discount Type is of Fixed type, the Rate represents a fixed discount amount that is applied irrespective of the quantity of the product charged.
However, if the Include Fixed Amount flag is selected, this is also being applied if the product has a Fixed Amount i.e. the discount is applied twice.
For Fixed discounts, the Include Fixed Amount flag should be ignored.
If a Discount Type is of Fixed type, the Rate represents a fixed discount amount that is applied irrespective of the quantity of the product charged.
However, if the Include Fixed Amount flag is selected, this is also being applied if the product has a Fixed Amount i.e. the discount is applied twice.
For Fixed discounts, the Include Fixed Amount flag should be ignored.