When the Enhanced Bundle Packs Feature is enabled for Order Management, why is an additional Order Line created for every standard Order Line?
To distinguish the Order Lines used for pricing and the Order Lines used to document quantities of product from a pack, a new Order Line record is created in the background. It represents the combination of each product that composes the Bundle Pack. The Additional Order Lines are not shown on the UI (User Interface) and are not counted for the overall Order (Quantity/Value).
CRM Help Documentation: Bundle Packs