Is it possible to use the getRelatedRecords method for custom lookup fields?

Is it possible to use the getRelatedRecords method for custom lookup fields?

No, you cannot use the getRelatedRecords method for custom lookup fields. It is possible to use this method to fetch related records for the system defined items. 

For example: You can get the Tasks/Events/Calls related to an Account, Contact, etc.

See Also API Methods
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