Dependent Requirements of Order with Interchangeable Components 

Use

During the planning phase, the product substitution order, which is assigned to the dependent requirement through a pegging relationship, contains the information on the substitution of a component from a planned order. The planned order itself does not have any substitution information. If you execute an ATP check for the planned order or set the conversion indicator, the system adopts the substitute component in the planned order and adjusts the dependent requirements of the planned order accordingly. An ATP check, which is repeated at a later time, updates the substitution data in the order, if required.

Features

Before the substitute components are adopted in the planned order, the order only contains dependent requirements for the original components. After the adoption, the order contains dependent requirements for the original and substitute components. The dependent requirement quantities are adjusted according to the substituted quantities. Accordingly, the order tree and the requirements list in the order processing view only contain items for the original components before the adoption of the components; afterwards, they contain items for the original and the substitute components.

The item category displays if an item is an original item or a substitute item. In the case of a substitute item, the reference item field refers to the original item for which a substitution has been executed. Even if an original component has been completely substituted by other products in the supersession chain, the system creates an item for the original component. This has the requirement quantity 0.

The requirements list and the order tree display an item with the requirement quantity 0, even if you have defined in the user settings that the order view should not display a dependent requirement with the requirement quantity 0. This setting is not relevant in product interchangeability for the order tree and the requirements list.

The following table gives an example of a requirements list after the adoption of substitute components. The example is based on a supersession chain with the successive products A, B, and C. A planned order has a dependent requirement of 100 pieces for component A, whose requirements date/time is in the validity period of B. During planning, the system determines that it can partially cover the dependent requirement for A with the remaining stock of 20 pieces for product A. For the remaining requirement quantity of 80 pieces, the system procures the valid product B. The successor of B, the product C, is not relevant. Therefore, there is a single substitution. A single substitution means that a component is completely or partially substituted by another component in the supersession chain.

 

Requirements list for a partial single substitution (A → B)

Component	Dependent requirement	Item number	Reference item	Item category	Comment
A	-20	1		Original item	When adopting the substitute component, the system reduces the dependent requirement quantity for the original component A to the available quantity of 20 pieces.
B	-80	2	1	Substitute item	The dependent requirement quantity for component B corresponds to the procurable quantity of 80 pieces.

 

Even when the original component A is completely substituted – as shown in the following table – the system creates an item in the requirements list for the component A with the requirement quantity 0.

 

Requirements list for a complete single substitution (A → B)

Component	Dependent requirement	Item number	Reference item	Item category	Comment
A	0	1		Original item	None of the original component A is available. Therefore, the system reduces the dependent requirement quantity for the component A to 0.
B	-100	2	1	Substitute item	The system procures 100 pieces of the successor component B. The dependent requirement quantity is therefore -100 pieces.

 

Dependent requirement items in a multiple substitution

A multiple substitution means that an original component is completely or partially substituted by at least two other components in the supersession chain. The requirements list in a multiple substitution does not differ in principle from the requirements list in a single substitution. It contains an item for the original component and for each substitute component.

You cannot transfer an in-house production order with a multiple substitution to SAP R/3. To avoid multiple substitutions in in-house production orders, you only use a supersession chain with two products (A – B) in SAP APO or update the bills of material in SAP APO in time. For more information, see Product Interchangeability with Order Processing in SAP R/3.