static function getRelationMassiveActionsSpecificities()
{
global $CFG_GLPI;
$specificities = parent::getRelationMassiveActionsSpecificities();
$specificities['itemtypes'] = Document::getItemtypesThatCanHave();
// Define normalized action for add_item and remove_item
$specificities['normalized']['add'][] = 'add_item';
$specificities['normalized']['remove'][] = 'remove_item';
// Set the labels for add_item and remove_item
$specificities['button_labels']['add_item'] = $specificities['button_labels']['add'];
$specificities['button_labels']['remove_item'] = $specificities['button_labels']['remove'];
return $specificities;
}