Use
The sub-product/base product is used in exchange agreements in which you deliver various materials to the exchange partner and/or receive various different materials from the exchange partner, but the exchange balance is only based on a specific material, the base product.
When the base product is used, what is billed is not the value of the actual material delivered (sub-product), but rather the value of the base product in the corresponding quantity. Every goods movement of sub-products results in the exchange balance being updated with base product in the same quantity.

You can make an agreement with your exchange partner to exchange three different types of diesel. However, you can enter one type of diesel as the base product for each of the sales contracts and purchase contracts assigned to the exchange agreement. The system will then use the type you chose when it calculates the exchange balance.
Prerequisites
Features
Goods Movements/Accounting (Borrow/Loan Exchange)
If a goods movement takes place within an exchange agreement with sub-product/base product functionality, the pricing will be based on the base product. As a result, in the accounting document of the goods movement, the logical inventory will be valuated based on the base product. The system posts the difference between the logical inventory (based on the base product) and the physical inventory (based on the sub-product) to an exchanges gain/loss account.
Exchange Balance (Evaluation Structure S036)
The exchange balance is created for every combination of sub-product - base product.
Logical Inventory Adjustment (LIA)
The logical inventory adjustment is based on the base product, because the logical inventory is also valuated based on the base product. But you can also enter the sub-product for information purposes. If you do not enter a sub-product, the system will automatically view the sub-product and base product as being the same.