Managing EBOMs-MBOMs > Managing part BOMs

Part BOM requirements

To create a part BOM from a design BOM:

The MEDesignToBom_Enabled preference must be set to true (default = false).
Part structures that are created in a part BOM using heavy alignment have parts with BOM view revisions (BVRs) that are not actually assemblies. Change any existing customizations to treat parts with BVRs as leaf lines if they are to be marked as end items.
The design BOM items and structures must either be created in a CAD system or empty design items created by a manufacturing engineer as a work order for the designer.
The design BOM must consist of design object types.
The part BOM must consist of part object types.
In the part BOM, add a precise clause to the top of the revision rules. Example The group feature can be used to create the following clause: Has Item Type (Design) {Precise}.

To calculate rolled-up variant conditions from the design BOM and add the logically equivalent variant condition to the aligned part line, add the bl_condition_tag property to the MEDesignToBomAlignmentProperties preference.

To avoid errors during heavy alignments, if you are using the TCAllowedChildTypes_ preference, you must modify it to allow design items. Similarly, if you use the TCAllowedParentTypes_ preference, modify it to allow part Items.