| # Engineering items E-Items and their Revisions Engineering items (E-items) are theoretical items that form the basis for real items that you can produce. An E-item usually has several revisions, or versions, that range from a prototype, to the item you manufacture, to an obsolete item. You can define revisions in the Engineering Item Revision (tiedm1100m000) session. Use the Engineering Item - Item Relationship (tiedm1101m000) session to link an approved revision to a production item. You can copy the E-Item revision to a production item in the Copy Engineering Item to Item (tiedm1201m000) session. Record E-item components in an EBOM with the Engineering BOM (tiedm1110m000) session. An EBOM has the same structure as a PBOM, but the revisions perform a similar function to the sequence number in a PBOM; that is, validity on different dates. You can copy an EBOM to a production BOM. You can copy E-items and EBOMs individually, or you can copy them using mass bill of material changes ( MBCs), which enable you to perform several actions simultaneously. E-Item Relationships Relationships between E-items and items form the link between an E-item revision and one or more items. You can use the link to copy a design change that you have made to an E-item to an actual standard or customized item. Example E-item: Mountain bike E-MB01
Revision | Description | Status
--- | --- | ---
A1 | Draft prototype of bike | In-design
A2 | Prototype bike | Approved for Engineering
A3 | Parent E-item of bike MB01 | Approved for Production
A4 | Obsolete bike | Canceled
Note that until the revision with the In-design status has been approved, you cannot create another revision. The actual revision for items is the most recent revision for which all the following conditions are met: A relationship between a production item and an engineering item must be present. For an item linked to an MBC, the effective date of the revision must be before today. Either no MBC is used or a related MBC with status Approved for Production must exist E-item - Item relationships You can define the relationship between an E-item and a produciton item in the Engineering Item - Item Relationship (tiedm1101m000) session. E-item/item relationships are used to: Determine the actual revision of a manufactured or purchased item that is linked to an E-item. Carry through revisions of E-items to the production of manufactured items. Revision status LN takes into account the revision status in the following situations: A revision can only be linked to an MBC (in the E-Item by MBC (tiedm3122m000) session) if the status is In-design. You can use the Print Where-Used Revision by MBC (tiedm3470m000) session to print a signal list. When you copy EBOMs with the EBOM Copy Data (tiedm1120m000) session, the revision of the parent E-item in the EBOM must have the Approved for Production status. LN sometimes uses relationships that you have defined in the Engineering Item - Item Relationship (tiedm1101m000) session to determine the values of the following fields in the EBOM Copy Data (tiedm1120m000) session: EBOM Copy Method To Item Item Category This is only possible if the revisions for which these relationships exist, have the status Approved for Production. You can only copy single-level EBOMs to PBOMs if the revision of the parent E-item has the status Approved for Production. Related topics Engineering data management summary Copying E-items to items Changing EBOMs - Automatic procedure |