How to update custom field in BUI

Content

In incident object, we have a custom field Essence ( Objects >> Incident >> CustomFields  >> CustAttrib  >> Essence). This is of type RightNow\Connect\v1_3\CO\Essence.

How do I update this using WorkspaceRecord.updateField() method

Something is wrong in mapping field name. "Incident.C$Essence"

Code Snippet

WorkspaceRecord.updateField('Incident.C$Essence', myCustomImplementation);

<script>
ORACLE_SERVICE_CLOUD.extension_loader.load("CUSTOM_APP_ID" , "1")
.then(function(extensionProvider)
	{
	IExtensionProvider.registerWorkspaceExtension(function(WorkspaceRecord)
		{
		WorkspaceRecord.updateField('Incident.C$Essence', myCustomImplementation); 
		}
	);
	}
);
</script>