# Change Management

## How to Perform a Change Operation on an Item Structure Relation referencing a Set

| ### What to do:
| In order to work through this example, you must have created a new item ART-1250 Ornamental Gold Ring with the work request EWR-1250 and completed the examples Creating a new Item Structure Relation (BOM) referencing a Set and Defining affected Objects of a Work Request BOM. Furthermore, you must have set the items and the item structure relations of the BoM to the state 220 | Approved.
| In this example the change operation is to replace the existing ART-1200 Ornamental Ring with ART-1250 Ornamental Gold Ring.
| Select Start > Items. The Item mask is opened.
| Search for the item ART-1000.
| Select the BOM tab.
| Activate work set 10 from the Item mask and click the Complete button.
| Please note that when completing the work set the items of the BoM will be released..
| Enter a date for the validity range of work set 10.
| To confirm click OK.
| In the BOM tab highlight the item structure relation of ART-1200 and select Change Management > Replace 1:1 from the context menu.
| The Replace 1:1 mask is opened.
| In the first table of the Replace 1:1 mask select the checkbox. The parent item ART-1000 is marked as an affected item of the change operation.
| Change to the Item Number field of the bottom table and click . An Items list is opened, displaying eligible items for the replacement of the existing one.
| Select the item ART-1250 Ornamental Gold Ring.
| To confirm click OK.
| The item structure relation of item ART-1200 has been replaced by the new item structure relation of the item ART-1250.
| The former item structure relation of ART-1200 is still visible but "ineffective" as indicated by the state 230 | Released and the validity date in the Valid from column.
| In the Change Operations (Structure) tab change operations are displayed in a hierarchical structure, reflecting the real structure of a BOM. It is possible to group the change operations according to individual preferences.
| Please note that change operations (except "Withdraw") can only be canceled if the window of the new item in the With this table is activated. To activate the item it is sufficient to click in the window!