Siemens SIMATIC PCS 7 System Manual page 62

Material management
5.2 Material classes
3. Click the "Save" button to save the changes.
4. Click the "Dismiss" button to discard the changes.
Deleting attributes
To delete an attribute, follow these steps:
1. Select the row of the attribute.
2. Select the "Delete row" command in the "Edit" menu.
The attribute is removed from the working area.
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Advanced Process Functions Engineering Manual
System Manual, 07/2016, A5E38719921-AA