Hierarchical BoM Tree

Hierarchical BoM Tree

The standard BoM structure cannot display a multi-level tree if a component is part of more than one item without duplicating the BoM line. The standard "Parent BoM field" allows to select only one parent at a time.

The ons_bom module allows you to build a hierarchical tree with the followings:

• each BoM line is defined once and only once
• each parent-child relation is defined once and only once but used everywhere it is needed
• each BoM line can have more than one parent

The key concept is that the hierarchical structure serves as the reference structure to regenerate the standard BoM structure, as used by the procurment module.

FAQs:

How to build the hierarchical structure?

You can use one of two methods and even combine both

1. Import your current BoM structure using the "Import standard BoM structure" wizard under the "Advanced" menu item
2. Build from scratch:

Under the "Advanced" menu item, you'll find the "Clear BoM line hierarchy" wizard to clean up an existing hierarchy if needed In each BoM line, you will find a new tab: "Hierarchy", in which you will be able to define all the BoM line's parents

Open the "Hierarchical BoM line view" to see the result.

How to build the standard BoM structure from the hierarchical structure?

Use the "Rebuild BoM structure" wizard" this will clear the actual BoM structure and build a new, fresh and coherent BoM structure

Can I modify a BoM line, once the BoM structure has been rebuilt?

Yes, but be sure to modify the original BoM line, not one of the copies To do that, use the following steps:

1. use the "Clear standard hierarchy" wizard this will remove

• all parent-child relations from the BoM structure only
• all BoM line copies (and only the copies)

please note that this will not modify the hierarchical structure

1. modify any BoM line that should be updated
2. use the "Rebuild standard hierarchy" wizard

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