How To Fix CNV780 - Table &1 was not dropped; the update phase must not start

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV - Conversion: Messages for Conversion Services (CNCC)

• Message number: 780

• Message text: Table &1 was not dropped; the update phase must not start

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CNV780 - Table &1 was not dropped; the update phase must not start ?

  The SAP error message "CNV780 Table &1 was not dropped; the update phase must not start" typically occurs during a system conversion or upgrade process, particularly when using the SAP S/4HANA Migration Cockpit or similar tools. This error indicates that a specific database table (denoted by &1) was expected to be dropped as part of the conversion process, but it was not successfully removed. As a result, the update phase cannot proceed.
  Causes:
  
  Table Dependencies: The table may have dependencies or relationships with other tables that prevent it from being dropped.
  Database Locks: There may be locks on the table that prevent it from being altered or dropped.
  Custom Modifications: If the table has been customized or modified in a way that conflicts with the upgrade process, it may not be dropped as expected.
  Incorrect Configuration: The configuration settings for the migration or upgrade process may not be set correctly, leading to issues with table management.
  Previous Errors: There may have been previous errors in the migration process that were not resolved, causing subsequent steps to fail.
  
  Solutions:
  
  Check Dependencies: Investigate the dependencies of the table in question. Use transaction codes like SE11 (Data Dictionary) or SE14 (Database Utility) to analyze the table and its relationships.
  Release Locks: If there are locks on the table, identify and release them. You can use transaction SM12 to check for and delete any locks.
  Review Custom Code: If there are custom modifications to the table, review them to ensure they are compatible with the upgrade process. You may need to adjust or remove these modifications.
  Run Pre-checks: Use the SAP Maintenance Planner or the SAP Readiness Check to run pre-checks before the upgrade to identify potential issues.
  Manual Drop: If you are certain that the table can be safely dropped, you can manually drop it using SQL commands or through the database utility. However, this should be done with caution and ideally in consultation with SAP support or your technical team.
  Consult SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide guidance on how to resolve it.
  
  Related Information:
  
  SAP Notes: Look for specific SAP Notes related to the CNV780 error message. These notes often provide detailed troubleshooting steps and solutions.
  Logs and Traces: Review the logs generated during the upgrade process (e.g., logs in transaction SLG1) for additional context on why the table was not dropped.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  
  If the issue persists after trying the above solutions, it may be necessary to engage SAP support for further assistance.