Thank you, I understand.
But I came up with one more problem.
I tried to re-configure "store order details server behavior" under server behavior wiondow, but somehow I can not see it.
I don't remember if I did anything to it, but it is not there. There is a coding for it under "// WA eCart Store Cart Details in Db", but not in the server behaivor window. I'm not confident to edit the code manually.
Is there anyway to get the "store order details server behavior" under server behavior window, or should I re-insert this server behavior from server behavior panel's data manipulation -->store cart details in database??