SAP Message XC305 - &1: Processing of returns only possible as of SAP APO 4.0

Diagnosis You have attempted to set up the processing of SD returns for systemV1. this system is specified as release v2. however, the processingof SD returns is only supported as of SAP APO 4.0. System Response The setting is saved. However, this setting will lead to a transfererror if your SAP APO release is actually earlier than SAP APO 4.0. Procedure Ensure that the correct SAP APO release is maintained for system &V1&.This setting is made in CIF Customizing under Basic Settings forSetting Up the System Landscape -> Specify SAP APO Release(transaction NDV2). Make the relevant (permitted)setting in this transaction.