Manage BOMs > Aligning the EBOM to the MBOM
BOM Alignment page
The default BOM Alignment interface may look different from that displayed below because your administrator can configure many aspects of it. The page consists of two panels, a source bill of materials (BOM) derived from engineering, and a target BOM derived from the source BOM but also defining specific manufacturing materials
Source and target BOM configurations are independent, as are the toolbar options above either panel. While manufacturing engineers do not have write access to the read-only source BOM, they can access toolbar navigation commands that allow them to compare and update the source and target BOM using structure and 3D graphic views, and can make changes to the target BOM using:
New and existing work packages that contain source and target BOM data.
Assignment status icons that indicate the current status of assembly and part elements that are unassigned or fully, partially, and over assigned from source BOM to and target BOM. Assignment statuses also indicate element changes that impact the target BOM, such as revisions and deletions.
The ability to restructure, revise, and release one or more BOM structures or the entire BOM.
Table columns that allow you to manually match source and target BOM properties, and change part quantities.
Change management. A change notice records engineering design changes to a product. You can associate work packages with change notices or propagate changes from EBOM to MBOM using tree structures rather than change notices.
Variants, revisions, and occurrence effectivity settings for selected elements. Note
Authoring of variant rules is not supported. Using a mixture of legacy and product configurator variants can cause data corruption. By default, the system uses the preference ME_EnableMixVariantModelCheck to prevent loading structures that use a mixture of these variants. If you are using only one variant, or no workflow results in mixed variants, change the value of ME_EnableMixVariantModelCheck to false. This value enables the system to open structures without a check.Visual comparisons of differences between source and target BOM CAD models using separate 3D viewer panels for each. For more information on 3D viewer options, see the Visualizing 3D Product Data section of the Active Workspace online help.
| (1) | The top line displays the work package name. Above each panel, a bread crumb indicates where you are in each structure (in this case, idf_air_craft for the source BOM and Wing_asm for the target BOM). When Show Assignment State is enabled, indications in the first few columns of the tables below the configuration areas and toolbars show assignment status and property mismatches. |
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| (2) | The Configuration button lets you configure BOM, BOP, and other structures. The Full Screen button lets you expand the interface to hide or show everything but the task and the BOM panels. |
| (4) | The configuration headers display current values and functions that you can modify using the Configuration button above. You can change revision list, date, units, and variants. |
| (4) | The areas above the source and target BOM are task-related, meaning that the manufacturing engineer can make alterations to some properties. You can move between parent and child elements in the panel trees using the bread crumb trail > or the tree navigation in either panel. |
| (5) | The source BOM toolbar lets you review part and assembly elements to be assigned to appropriate locations in the target BOM. You can validate effectivity coverage, find parts or assemblies in either BOM, change configuration rules, and view selected source BOM part or assembly properties. |
| (6) | The target BOM toolbar lets you author and configure target BOM parts and assemblies by: Assigning source BOM elements to a target BOM while navigating both structures. Adding and removing manufacturing elements such as containers and welds (phantom nodes) not used in the source BOM. Matching source BOM and target BOM table properties. Revising manufacturing assemblies. Releasing target BOM changes to a workflow or submitting target BOM changes to a workflow. Configuring source or target BOM rules such as occurrence effectivities and equivalent assignment scopes. Finding parts or assemblies in the target BOM, or finding an assigned target BOM element in the source BOM. Viewing selected target BOM parts or assemblies in the 3D viewer panel, or viewing detailed part or assembly summary properties. Restructuring a target BOM by moving assigned parts and target BOM-specific nodes as needed. Associating a work package with a change notice and using the Change Summary panel to decide which changes are updated from the source BOM to the target BOM. Editing selected object properties in Microsoft Excel. Configuring variant conditions on target BOM nodes just as you would on operations from the Process Planning page. Learn more about navigating. |
| (7) | By default, the panels below the source and target BOM panels display details and attachments related to the element selected in either panel. From the EBOM or MBOM toolbars, you can use the Details button to view part or assembly properties. These include the ability to use, add, or remove substitute or global alternate parts in a target BOM. You can also switch to the 3D viewer panels below the BOM panels. The 3D viewer panel lets you explore 3D data (JT) associated with parts and assemblies. You can use the panel to manipulate views, query and measure parts and features, view part and assembly level product and manufacturing information (PMI), and create 3D sections through your data. For details on using the 3D viewer common to Active Workspace, see the Visualizing 3D Product Data section in the Active Workspace help. |
Source: https://docs.sw.siemens.com/en-US/doc/282219420/PL20251212545240207.xid2214895/xid1852892 · retrieved 2026-07-11