Why is it necessary to define a node type hierarchy? - Intergraph Smart Materials - Version 2020 (10.0) - Help - Hexagon

Intergraph Smart Materials Web Help (2020)

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With the definition of the node type hierarchy you ensure that a fixed structure of the node types is enforced in the work breakdown structure (WBS). The hierarchy structure comes into effect only when the project default ZB_BOMHIER (Free BOM Structure) is set to N. If ZB_BOMHIER is set to N and no entries are available in Node Type Hierarchy page, it is not possible to create list nodes.