SAP Message TU235 - Budget billing plan cannot be changed; transaction currency has changed

Diagnosis
The budget billing plan adjustment could not be executed because thetransaction currency in contract account &V1& has been changed.
When budget billing plan &V2& is adjusted duringextrapolation (ratemaintenance, automatic adjustment (3)) the extrapolation lines of thebilling document are created with the new transaction currency.However, the transaction currency in a budget billing plancannot be changed due to posting reasons.

System Response
INCLUDE ISU_VERARB OBJECT DOKU ID TX

Procedure
Use percentage adjustment (1 or 2) for the automatic adjustment of abudget billing plan.