function deleteStoredObjectAttribute($contentObjectAttribute, $version = null)
{
$db = eZDB::instance();
$userID = $contentObjectAttribute->attribute("contentobject_id");
$res = $db->arrayQuery("SELECT COUNT(*) AS version_count FROM ezcontentobject_version WHERE contentobject_id = {$userID}");
$versionCount = $res[0]['version_count'];
if (($version == null || $versionCount <= 1) && eZUser::fetch($userID) !== null) {
eZUser::removeUser($userID);
$db->query("DELETE FROM ezuser_role WHERE contentobject_id = '{$userID}'");
}
}