This project default specifies whether you want to allow free BOM structures. It is sometimes also called BOM hierarchy.
With this project default, you can control if the structure of the WBS on B.20.01 must have a hierarchy or not. If you, for example, want to ensure that a node for isometric drawings is only to be created below a node for a line, you would set this project default to Y. When this default is set to Y, the hierarchy can be controlled on B.10.07.
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Module(s) affected by this setting: B2001, B2003
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Default value: Y
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List of Values: N/Y