hook_db_prevoid($po, ST_PURCHORDER);
$sql = "DELETE FROM ".TB_PREF."purch_orders WHERE order_no=".db_escape($po);
db_query($sql, "The order header could not be deleted");
$sql = "DELETE FROM ".TB_PREF."purch_order_details WHERE order_no =".db_escape($po);
db_query($sql, "The order detail lines could not be deleted");
hook_db_prevoid($po, ST_PURCHORDER);
$sql = "DELETE FROM ".TB_PREF."purch_orders WHERE order_no=".db_escape($po);
db_query($sql, "The order header could not be deleted");
$sql = "DELETE FROM ".TB_PREF."purch_order_details WHERE order_no =".db_escape($po);
db_query($sql, "The order detail lines could not be deleted");