/*
* Disable Display Name editing
*/



function bpdev_filter_profile_fields_by_usertype($fields,$group_id) {

//only disable these fields on edit page

  if(!bp_is_user_profile_edit())
    return $fields;

  $field_to_remove=array("Display Name");

  $count=count($fields);

  $flds=array();

  for($i=0;$i<$count;$i++){

    if(in_array($fields[$i]->name,$field_to_remove))
     {
       unset($fields[$i]);
     }
      else
      $flds[]=$fields[$i];

  }

  return $flds;
}

add_filter("xprofile_group_fields","bpdev_filter_profile_fields_by_usertype",10,2);