Message type: E = Error
Message class:  CNV - Conversion: Messages for Conversion Services (CNCC) 
Message number: 770
Message text: No index was dropped during the conversion
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The SAP error message "CNV770 No index was dropped during the conversion" typically occurs during a data conversion process, particularly when using the SAP S/4HANA Migration Cockpit or other data migration tools. This message indicates that the system expected to drop certain database indexes as part of the conversion process, but no indexes were actually dropped.
Cause: No Indexes to Drop: The most straightforward reason for this message is that there were no indexes defined on the tables being processed that needed to be dropped.
Configuration Issues: There may be a misconfiguration in the conversion settings or parameters that leads to the system not identifying any indexes to drop. Data Model Changes: If the data model has changed (for example, if the target system does not require certain indexes), the conversion process may not find any indexes to drop. Conversion Logic: The logic in the conversion program may not be set up to handle the
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