Message type: E = Error
Message class:  CNV_MBT_09_A - Message class for drop-solution 
Message number: 353
Message text: All views are active.
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The SAP error message CNV_MBT_09_A353 with the description "All views are active" typically occurs during the execution of a data migration or conversion process, particularly when using the SAP S/4HANA Migration Cockpit or similar tools. This error indicates that the system has detected that all views (or data objects) that are supposed to be processed are already active, meaning that there are no changes or updates to be made.
Cause: No Changes Detected: The primary cause of this error is that the migration process is trying to activate views that are already active in the system. This can happen if the migration process has already been executed successfully, or if the data has not changed since the last execution.
Configuration Issues: There may be configuration issues in the migration settings that lead to the system incorrectly identifying the status of the views. Data Integrity: The data being migrated may already be in the target
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