$path_to_root="..";
-include($path_to_root . "/purchasing/includes/supp_trans_class.inc");
+include_once($path_to_root . "/purchasing/includes/supp_trans_class.inc");
$page_security=5;
-include($path_to_root . "/includes/session.inc");
+include_once($path_to_root . "/includes/session.inc");
include_once($path_to_root . "/includes/data_checks.inc");