I have a custom field (Associated_Contact__c) on my lead object to create a relationship to an associated contact (via lookup field).
The field is populating as expected, but when I look at the related object list for leads on the contact, it's empty. An SOQL query for the contact using the relationship field (Associated_Lead__r) also returns a result for the lead as expected.
What reason could there that the lead is not populating on the related object list? (I suspect something in field level security, but I'm not sure).