Engineering BOMs

An engineering bill of material (EBOM) describes the relationships of components to their parent items in the same way that a production bill of material (PBOM) does. The main difference between an EBOM and a PBOM is that rather than having a sequence number to take account of items valid on different dates, EBOMs use different revisions of E-items.

Copying an EBOM

A single-level EBOM can be copied to a single-level PBOM by one of the following three methods:

  • All Available Lines. All PBOM lines expire and are replaced by the EBOM lines and non-EBOM lines. Non-EBOM lines are lines from a non-project PBOM that are copied to a project. See the copy method NonProj Item to Proj Item.
  • Only Corresponding Pos.. Lines in the PBOM whose line numbers match the line numbers in the EBOM are replaced by the corresponding EBOM lines and non-EBOM lines. The other PBOM lines remain unchanged.
  • Corresp. and Linked Pos.. Both lines in the PBOM whose line numbers match the EBOM line numbers, and lines which do not match but have been created by previous finalizing actions performed on engineering data (the Link with EDM check box in the Bill of Material (tibom1110m000) session is selected, are replaced by the EBOM lines and non-EBOM lines.

The other lines from the PBOM remain unchanged. These unchanged lines are not engineering-related. An example of one of these lines could be packing materials. In this way, you can make a clear distinction in production BOMs between engineering-related components and logistics components that do not relate to engineering.

If you copy the EBOM to the PBOM, the expiry date of the PBOM component is filled by either:

  • The effective date of the revision for the parent E-item from the EBOM.
  • The effective date of the PBOM line, if it expires later.

The effective date of the PBOM line expires later than that of the EBOM line if:

To include the line from the EBOM, a new serial number is created for the line in the PBOM.

Determining engineering BOM copy data

When you copy an EBOM line to a PBOM using the EBOM Copy Data (tiedm1120m000) session, LN copies default values to the new BOM from the EBOM from the following fields:

  • EBOM Copy Method.
  • To Item.
  • Item Category.

An EBOM's parent item is a particular revision of an E-item. The components can be items or E-items.

When you copy a component from an EBOM to a PBOM, you can use the EBOM Copy Data (tiedm1120m000) session to define one of the following copy methods:

  • No Copy Action
    No components are copied.

    This occurs in the following circumstances:

    • The units of the components in the Component and To Item fields do not match.
    • There is no valid released revision of the E-item.
    • The component in the EBOM is not a physical E-item.
    • A project item is copied to another project item, for which there is no relationship with either the item or with the project.
  • Copy E-Item to Item
    Copy the E-item to an item and copy the relevant EBOM line to the PBOM line.
  • NonProj Item to Proj Item
    Do not copy an E-item or EBOM, but copy a non-project item to a project item (that is, a standard item to a customized item). Also copy the non-project item's bill of material and routing to the project item's bill of material and routing.
  • EBOM to PBOM Only
    Copy only one line from the EBOM to the PBOM.
Which copying method should I use?

To determine which copying method you must use, answer question 1 and follow the instructions.

  • Question 1
    Is the source component a project item (that is, is a project defined in the first segment of the item code)?
    • If the answer is yes, proceed with question 3.
    • If the answer is no, proceed with question 2.
  • Question 2
    Is the target component a project item?
    • If the answer is yes, select copy method NonProj Item to Proj Item.
    • If the answer is no, proceed with question 4.
  • Question 3
    Is there a relationship with the same project?
    • If the answer is yes, select copy method EBOM to PBOM Only.
    • If the answer is no, proceed with question 4.
  • Question 4
    Is there a relationship with the target item?
    • If the answer is yes, proceed with question 5.
    • If the answer is no, select copy method No Copy Action.
  • Question 5
    Does the item exist already?
    • If the answer is yes, select copy method EBOM to PBOM Only.
    • If the answer is no, select copy method Copy E-Item to Item.
Relationships

When searching for items using relationships defined in Engineering Item Revision (tiedm1100m000) session, LN uses the following rules:

  • When data is copied to a project, relationships with project items take priority over relationships with non-project items.
  • When data is not copied to a project, only relationships with non-project items apply.

When searching for relationships, the following priorities apply:

  • relationships created by, or used in, copying from an EBOM have priority over relationships created by, or used in, copying an E-item to an item.
  • Relationships created by, or used in, copying an E-item to an item have priority over relationships not used in copying.

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