General help

Good afternoon I need your help with an issue that is tormenting me I created the fields for users: Position, Department, and Company. (Use version 3.1)

Importing works great, but when I want to export to excel not bring me these fields, I was researching how playing the file admin / settings / grades.php

$temp->add(new admin_setting_configtext('grade_export_userprofilefields', new lang_string('gradeexportuserprofilefields', 'grades'), new lang_string('gradeexportuserprofilefields_desc', 'grades'), 'firstname,lastname,city,profile_field_Business,profile_field_Departament', PARAM_TEXT));

        $temp->add(new admin_setting_configtext('grade_export_customprofilefields', new lang_string('gradeexportcustomprofilefields', 'grades'), new lang_string('gradeexportcustomprofilefields_desc', 'grades'), '', PARAM_TEXT));

Please, help!