Similar issue is being filed here https://issues.civicrm.org/jira/browse/CRM-17831.
This has been fixed in 4.7.2 at https://github.com/civicrm/civicrm-core/pull/7770/files.
Update: As xml files are not included in the downloaded Civi. For the time being, can you please make the following changes at
fields() function in
'formal_title' => array( 'name' => 'formal_title', . . . 'export' => true, 'html' => array( <--- include this 'type' => 'Select''Text', ) , ) ,