$result = db_query($sql,"check failed");
if (db_num_rows($result) == 0)
{
$sql = "INSERT INTO ".TB_PREF."bom (parent, component, workcentre_added, loc_code, quantity)
$result = db_query($sql,"check failed");
if (db_num_rows($result) == 0)
{
$sql = "INSERT INTO ".TB_PREF."bom (parent, component, workcentre_added, loc_code, quantity)