related_items_title

function commerce_related_lines_line_item_title($line_item) {
  if (variable_get('use_title', FALSE)) {
  $title = $line_item_wrapper->commerce_product_line_item_ref->commerce_product->title->value();
  }
  else {
    // Retrieve the price type for use as a title.
    $line_item_wrapper = entity_metadata_wrapper('commerce_line_item', $line_item);
    $price_type = $line_item_wrapper->commerce_related_lines_type->value();

    // Retrieve the price type titles.
    $price_types = commerce_price_component_titles();
    $title = $price_types[$price_type];
  }

  // Allow other modules to alter the title as they see fit.
  drupal_alter('commerce_related_lines_title', $title, $line_item);

  return $title;
}