Diagnosis
You tried to set the business area at event 0945. This is only allowedfor tax items. In the standard system, tax items in Contract AccountsReceivable and Payable do not display a business area. However, it mightbe necessary to display a business area. This is the case when you haveactivated New General Ledger Accounting along with document splitting,and you have specified in Customizing that the business area is arequired entry field.

System Response
The reconciliation key cannot be transferred.

Procedure
Changing the business area is only allowed for tax items.