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To protect your data integrity during migration, create a unique external identifier field. Create this field on the Ad Available Target Segment object before you clone the mapping template.
| Available in: Lightning Experience |
| Available in: Enterprise, Performance, and Unlimited editions with Media Cloud- Advanced |
| User Permissions Needed | |
|---|---|
| To create an external identifier: | Customize Application |
The system populates the field API name automatically.
Select Do not allow duplicate values and Set this field as the unique record identifier from an external system.
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