Message type: E = Error
Message class:  CNV - Conversion: Messages for Conversion Services (CNCC) 
Message number: 078
Message text: Table &1 configured not to use optimized cluster technique.
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The SAP error message CNV078 indicates that a specific table (denoted as &1 in the message) is configured not to use the optimized cluster technique. This message typically arises during data migration or conversion processes, particularly when using SAP's Data Migration tools or the SAP S/4HANA Migration Cockpit.
Cause: The error occurs because the table in question is set up in a way that does not allow for the optimized cluster technique, which is a method used to improve performance during data processing. This can happen for several reasons: Table Configuration: The table may be configured in a way that does not support the optimized cluster technique. This could be due to its structure, the types of data it holds, or specific settings in the database. Data Migration Settings: The settings in the data migration tool or the specific migration project may not be configured to allow for optimized processing for that table. Database Constraints:
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