I'm looking to simply use populate_list to pull a relationship from Leads into Opportunities. I've created what I thought was the correct simple file of:
<?php $dictionary["Lead"]["fields"]["opportunity"]['populate_list'] = [ 'contacts_leads_1_name' => 'contacts_opportunities_1_name', ];
However this has failed to work, I've put this file here - custom/Extension/modules/Leads/Ext/Vardefs
Simply it should pull the Contact through to the Opp in the custom relationship. Have I missed anything obvious?