Assemblies (SAP Library - BOMs (PP-BD-BOM))

Assemblies

A group of semi-finished products or parts that are assembled together and form either a finished product or a component of a finished product is known as an assembly.

An assembly is identified by a material number and generally functions as a single unit.

The graphic below shows the assembly " GEARS" , a Derailleur gear system that is made up of four components.

This graphic is explained in the accompanying text

A product defined as an assembly, such as the Derailleur gear system in the graphic above , can in turn be used as a component in another assembly, such as MRB01 Men’s racing bicycle (see graphic in topic Single-Level BOMs).

Note

The term "assembly" comes from material BOM applications. In document structures (in document management applications) this term refers to a coherent grouping of a quantity of documents and texts.

Phantom Assemblies

A phantom assembly is a logical (rather than functional) grouping of materials.

From the design point of view, these materials are grouped together to form an assembly. The components of a phantom assembly are grouped together to be built into the assembly on the next level up the product structure.

From the production point of view, these materials are not actually assembled to form a physical unit.

Example

Assembling a pair of gearwheels

Engineering/design view: one assembly

Assembly view:

Gearwheel 1 goes into the driving gear

Gearwheel 2 goes into the output gear

You can define the special procurement key phantom assembly in the material requirements planning (MRP) data of the material master record for a material.

Dependent requirements for the superior assembly are passed directly down to the components of the phantom assembly, skipping the phantom assembly. Planned orders and purchase requisitions are also produced only for the components of the phantom assembly.