You can have a custom attribute that is fed directly into Salesforce B2C Commerce from
a backend system-of-record.
You can set the externally-managed flag to indicate to Business Manager users that
they shouldn't edit these attribute directly. Such an attribute is considered externally
managed, because the attribute values are set in an external system. If the feed for an
uneditable attribute contains an incorrect value, you can fix the value by deselecting the
Externally Managed option and manually fixing it. When the value is fixed,
reselect the Externally Managed option.
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Select Administration > Site
Development > Custom Object Types | System Object
Types .
The Custom Object Type List page opens or the System
Object Type List page opens.
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Click the name of the object with the attribute that you want to
restrict access to.
The Custom Object Types > (custom object) page
appears or the System Object Types > (system object) page
opens.
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Click the Attribute Definitions tab.
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Click the name of the attribute to restrict access to.
You can't restrict access to system attributes, only custom
attributes.
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Select the Externally Managed box.
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Click Apply.