BOM Explosion and Determining Dependent Requirements

Implementation Options

The BOM is exploded and the dependent requirements are determined within MRP during the planning run, after the system has performed the procurement quantity calculation, lot-size calculation and scheduling.

The bill of material is exploded for every new procurement proposal for an assembly during the planning run. Dependent requirements, which mean the required quantities, are determined for all the assemblies and components needed to produce the product.

Prerequisites

You have created a BOM that has a valid period and area (see Period/Area of Validity of BOMs ).
The BOM status is set to active for MRP (see BOM Status ).
The BOM components are relevant for production (see BOM Items Relevant for Production ).
You have maintained a selection ID for the priority of the BOM in Customizing for Bills of Material, in the IMG activity Define order of priority for BOM usages .

If you have created alternative BOMs, you have entered the corresponding indicator for the alternative BOM selection in the Selection method field in the material master (see Multiple BOMs ).

If the system is also to re-explode the BOM for existing procurement proposals during the planning run, at least one of the following prerequisites must be fulfilled:

The quantity or date of the procurement proposal has changed.
The BOM for the assembly has changed.
You have entered the indicator 2 for Re-explode BOM in the Planning mode field of the initial screen of the planning run.

Process Flow

The system determines the valid BOM that is to be used for the explosion and for determining the dependent requirements (see Determining the Valid BOM ).
Alternative items and discontinued parts are taken into account within the valid BOM (see Alternative Items , Discontinued Parts ).
Special cases:

If you work with variant configuration and you have created a super BOM for the standard product, the system plans the components of the configurable product when the BOM is exploded in the planning run (see BOM Explosion for Variant Configuration ).
Phantom assemblies are also taken into account when the BOM is exploded (see BOM Explosion with Phantom Assemblies ).

You can define for products with a high number of components that total requirements are to be generated when determining the dependent requirements. You can thus improve system performance during the planning run (see Total Requirements ).

The system determines the date for the dependent requirements on which the components are to be available for the production (see Determining the Dependent Requirements ).

The system can determine the issue storage location for the components when the BOM is exploded. The system then displays this issue storage location in the component list for the planned order (see Storage Location Determination in BOM Explosion ).

Direct procurement and direct production of components are also triggered in the BOM explosion of the planning run (see Direct Procurement , Direct Production ).

If necessary, existing revision levels are taken into account in the BOM explosion (see Linking the Revision Level ).