Functional Area Implementation

Hi,

We have Activated Fund Management and also activated Functional Area in PSM >General Setting >Basic Setting-->Activate Account Assignment Element

Now when we are going to create Process Order Confirmation in PP (TCode: COR6N) we are getting the following ERROR

'Value BLANK/SPACE is invalid for accnt assignmt element "functional area"'

Error Message No.841, Application Area F6.

Could anybody help me how this error can be removed?

Regards

Rahkes