We have a Grouped product that consists of 3 books. When the customer selects the grouped product, they are given checkboxes to select each of the three books and they get placed in the cart as three separate line items.
We have a Shopping Cart Price rule that discounts the "group" by $20.
Now, when the customer selects a single group, the discount is applied. But then they select more than one of the grouped products, the discount is only being applied once.
How can I make that discount apply to ALL?