Diagnosis
A cost center group (hierarchy area) was planned for the current forceelement based on the Customizing settings (country, organizational area,structure level). No cost center group assignment exists for therequested period.

Procedure
If the Workbench account assignment workflow was activated inCustomizing, you can start this now.
The person responsible in managerial accounting receives a workflow thatenables automatic hierarchy object generation. Generation takes placeafter an approval step.
If this was carried out successfully, you receive a success message inyour workflow inbox. From there, you can go directly to the relevantforce element, and change the status if necessary.
Alternatively:
You can assign the cost center groupmanually on the 'Accounting' tab page(Create Hierarchy Node, Assign Hierarchy Node to Force Element).