cost element

Dear All,

I am a SD consultant.. I am facing a problem regarding cost element.

When i am creating a purchase order i am getting an error -' create a/c 410000 for 24.03.2009 as a cost element in controlling area. Let me tel you that the scenerio i am working is third party order. Also, in the schedule line category for account assignment i have maintained as order.

Thanx in advance.

Regards,

Pankaj