There are a number of project defaults available for the E&PI(BOM) module that can be set on the A.20.12 Project Defaults screen on the project level or on the A.20.13 Project Discipline Defaults screen on the project discipline level. A complete list of all project defaults with a detailed description of their meaning and usage and how to define the values can be found in E&PI (BOM) Project Defaults (ZB).
How to set the project defaults depends on corporate procedures and on project requirements.
These are the recommended settings regarding the BOM setup:
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ZB_1MSTR (Only one master node?) = Y
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ZB_BOMHIER (Free BOM structure?) = N
With these settings, you enforce a fixed WBS (Work Breakdown Structure). A more detailed explanation will be provided in the Setup section under BOM structure.
The project defaults that apply to a specific Smart Materials screen can be seen by clicking the Valid settings button on that screen. See the picture below for an example (B.20.03).