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Lookup Relationship Fields on External Objects
Use a lookup relationship when the external data includes a column that identifies related Salesforce records by their 18-character IDs.
Use a lookup relationship when the external data includes a column that identifies related Salesforce records by their 18-character IDs.
A lookup relationship field links a child standard, custom, or external object to a parent standard or custom object. A user who’s editing a child record can click the field’s lookup icon to select a specific parent record, and a user who’s viewing a parent record can view a related list of child records.
When you create a lookup relationship field on an external object, enter the External Column Name that contains the 18-character Salesforce IDs for identifying the parent records.

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