We need to change the maintenance and planning plant of an equipment in order to specify his new location when it is transfered. Although it is described as a normal procedure in SAP help, we receive error message IO 231 saying that "maintenance plant A and planning plant B are in different controlling areas" and SAP does not let us proceed with the plant change ! Did anybody have the same experience ? I believe that it is probably a customizing setting somewhere in FI-CO ! Any help is welcome.