How To Fix CNV_DMC_SIN398 - Catalog item &1 in inst. &2, catalog &3 has duplicated external ID &4

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 398

• Message text: Catalog item &1 in inst. &2, catalog &3 has duplicated external ID &4

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_DMC_SIN398 - Catalog item &1 in inst. &2, catalog &3 has duplicated external ID &4 ?

  The SAP error message CNV_DMC_SIN398 indicates that there is a duplication of external IDs in the data migration process, specifically related to catalog items. This error typically arises during the data migration phase when using the SAP Data Migration Cockpit (DMC) or similar tools.
  Cause:
  The error occurs when:
  
  There are multiple entries in the source data that have the same external ID for a catalog item.
  The external ID is expected to be unique for each catalog item within the specified instance and catalog.
  The data being migrated may have been incorrectly prepared, leading to duplicate entries.
  
  Solution:
  To resolve this error, you can follow these steps:
  
  
  Identify Duplicates:
  
  Review the source data for the catalog item in question. Look for entries with the same external ID.
  You can use tools like Excel or SQL queries to identify duplicates in your dataset.
  
  
  
  Correct the Data:
  
  Once duplicates are identified, you need to decide how to handle them. Options include:
  
  Merging duplicate entries if they represent the same item.
  Renaming or reassigning external IDs to ensure uniqueness.
  Removing unnecessary duplicates if they are not needed.
  
  
  
  
  
  Revalidate the Data:
  
  After making corrections, revalidate the data to ensure that there are no more duplicates.
  Ensure that the data structure adheres to the requirements of the SAP system.
  
  
  
  Retry Migration:
  
  Once the data is cleaned and validated, attempt the migration process again.
  
  
  
  Related Information:
  
  Data Migration Cockpit (DMC): This is a tool provided by SAP to facilitate the migration of data from legacy systems to SAP S/4HANA or other SAP systems.
  External ID: This is a unique identifier used to reference catalog items. It is crucial for maintaining data integrity during migration.
  Best Practices: Always back up your data before making changes, and consider running a test migration with a subset of data to ensure that the process works smoothly.
  
  If the issue persists after following these steps, you may want to consult SAP support or refer to the official SAP documentation for further troubleshooting.