Structure of a BOM in SAP

April 15, 2010 by mySAP
Filed under: Production Planning Module

BOM Header

In the BOM header, you maintain data that refers to the entire object:

For a multiple BOM, this means one of the alternative BOMs for an object (for example, a product)
For a variant BOM, this means one of the variants

This data is maintained on various header details screens in SAP system. On each detail screen, you see the header data that identifies the BOM uniquely in the SAP system.

BOM Items

BOM items are the component parts of a product. Item data applies to only one actual item in a BOM.

Some data has to be entered for all item categories as soon as you create an item. Other specific data can be completed in the application areas (such as design and purchasing) for all item categories.

This section describes the data required for creating items of all item categories. The data which is dependent on item category is described in detail in Item Detail Screens.

Sub-Items

Partial quantities of a BOM item may be installed at different points. Sub-items are used to describe the different installation points of these partial quantities.

In Customizing for Production, you define for each item category whether sub-items are supported by choosing Bill of material > Item Data > Define item categories. For example, in the standard system, sub-items are supported for Stock items and Variable-size items.

In the standard SAP system, changes to sub-item data are not recorded by engineering change management. In Customizing for bills of material, under Define modification parameters, you can define whether the old change state of a sub-item is retained after you change the sub-item.

If at least one values of the sub-item is changed with changed effectivity parameters, the system creates a new item record for the new change state. You can maintain the sub-item quantity and a description for each sub-item.