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How To Fix CNV_DMC_SIN255 - Material &1 already exist


SAP Error Message - Details

  • Message type: E = Error

  • Message class: CNV_DMC_SIN - Messages for s-innovations migration

  • Message number: 255

  • Message text: Material &1 already exist

  • Show details Hide details
  • What causes this issue?

    Material already exists. If you want to enhance an already existing
    material please use migration object ' Material - extend existing record
    by new org levels.

    System Response

    The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

    How to fix this error?

    Delete these records from the template.

    Procedure for System Administrators


    Error message extract from SAP system. Copyright SAP SE.


Smart SAP Assistant

  • What is the cause and solution for SAP error message CNV_DMC_SIN255 - Material &1 already exist ?

    The SAP error message CNV_DMC_SIN255, which states "Material &1 already exists," typically occurs during data migration or data conversion processes, particularly when using the SAP Data Migration Cockpit (DMC) or similar tools. This error indicates that the system is attempting to create a material that already exists in the database.

    Cause:

    1. Duplicate Material Creation: The most common cause is that the material number being imported or created already exists in the system. This can happen if:

      • The data being migrated includes materials that were previously created.
      • There is a mismatch in the data being processed, leading to attempts to create the same material multiple times.
    2. Data Preparation Issues: The source data may not have been adequately cleaned or deduplicated before migration, leading to attempts to create duplicate entries.

    3. Incorrect Mapping: If the mapping of fields during the migration process is incorrect, it may lead to the same material being processed multiple times.

    Solution:

    1. Check Existing Materials: Before running the migration, check the target system for existing materials. You can do this by using transaction codes like MM03 (Display Material) or using reports to list existing materials.

    2. Data Cleansing: Ensure that the source data is cleansed and deduplicated. Remove any duplicates from the data file that is being imported.

    3. Adjust Migration Logic: If the migration process allows, adjust the logic to skip existing materials or update them instead of trying to create them again.

    4. Use Unique Identifiers: Ensure that the material numbers being imported are unique and do not conflict with existing entries in the target system.

    5. Error Handling: Implement error handling in your migration process to log and manage errors effectively, allowing you to review and address issues without halting the entire migration.

    6. Consult Documentation: Review the SAP documentation related to the Data Migration Cockpit or the specific migration tool you are using for any additional guidelines or best practices.

    Related Information:

    • SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
    • Migration Tools: Familiarize yourself with the specific migration tools and their configurations, as they may have settings that can help manage duplicates.
    • Testing: Always perform a test migration in a non-production environment to identify potential issues before executing the migration in the live system.

    By following these steps, you should be able to resolve the CNV_DMC_SIN255 error and successfully complete your data migration process.

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