Diagnosis
You tried to create or change a cost estimate in object currency &v2&.

System Response
You can only make cost estimates in the controlling area currency.

Procedure
If planning in &v1& is allowed in Customizing, change the transactioncurrency before you call costing.
Otherwise, you have to change the object currency of the appropriationrequest to &v1& first. However, this is only possible if plan valueshave not yet been entered.