How To Fix CNV_DMC_VM020 - The visibility of the header structure cannot be changed to '&1'

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_DMC_VM - S/4 Migration: Texts for View Management

• Message number: 020

• Message text: The visibility of the header structure cannot be changed to '&1'

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_DMC_VM020 - The visibility of the header structure cannot be changed to '&1' ?

  The SAP error message CNV_DMC_VM020 typically occurs in the context of data migration or conversion processes, particularly when using the SAP Data Migration Cockpit (DMC) or similar tools. This error indicates that there is an issue with the visibility of a header structure in the data migration process.
  Cause:
  The error message "The visibility of the header structure cannot be changed to '&1'" suggests that there is an attempt to modify the visibility of a header structure in a way that is not allowed. This could be due to:
  
  Incorrect Configuration: The header structure might be incorrectly configured in the migration project.
  Data Model Constraints: The data model may have constraints that prevent changing the visibility of certain fields or structures.
  Incompatibility: There may be an incompatibility between the source and target systems or data structures.
  Authorization Issues: The user executing the migration may not have the necessary authorizations to make changes to the header structure.
  
  Solution:
  To resolve the CNV_DMC_VM020 error, you can take the following steps:
  
  
  Check Configuration: Review the configuration of the migration project to ensure that the header structure is set up correctly. Make sure that the visibility settings are appropriate for the data being migrated.
  
  
  Review Data Model: Examine the data model for any constraints or rules that might be preventing the change in visibility. Ensure that the header structure aligns with the expected data model.
  
  
  Consult Documentation: Refer to the SAP documentation for the Data Migration Cockpit or the specific migration tool you are using. There may be guidelines or best practices regarding header structures and their visibility.
  
  
  User Authorizations: Verify that the user executing the migration has the necessary authorizations to modify the header structure. If not, consult with your SAP security team to obtain the required permissions.
  
  
  Check for Updates: Ensure that your SAP system is up to date with the latest patches and updates, as there may be bug fixes or improvements related to the migration tools.
  
  
  Contact SAP Support: If the issue persists after checking the above points, consider reaching out to SAP Support for further assistance. Provide them with detailed information about the error, including the context in which it occurs.
  
  
  Related Information:
  
  SAP Notes: Search for relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  Training and Documentation: Review any training materials or documentation related to the SAP Data Migration Cockpit to better understand how to configure and manage header structures.
  
  By following these steps, you should be able to identify the root cause of the CNV_DMC_VM020 error and implement an appropriate solution.