How To Fix UGMD8123 - Conversion damages unique indexes

SAP Error Message - Details

• Message type: E = Error

• Message class: UGMD8 - Change Management

• Message number: 123

• Message text: Conversion damages unique indexes

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message UGMD8123 - Conversion damages unique indexes ?

  The SAP error message UGMD8123, which states "Conversion damages unique indexes," typically occurs during data conversion or migration processes, particularly when working with database tables that have unique indexes. This error indicates that the data being processed may violate the constraints of unique indexes, leading to potential data integrity issues.
  Cause:
  
  
  Duplicate Data: The most common cause of this error is the presence of duplicate records in the data being converted or migrated. If the data being inserted or updated contains values that would violate the uniqueness of an index, this error will be triggered.
  
  
  Data Transformation Issues: During data transformation, if the logic applied to the data results in duplicates, this can also lead to the error.
  
  
  Incorrect Mapping: If the mapping of fields from the source to the target does not maintain uniqueness, it can cause this error.
  
  
  Concurrency Issues: If multiple processes are trying to insert or update records simultaneously, it may lead to conflicts with unique indexes.
  
  
  Solution:
  
  
  Identify Duplicates: Before performing the conversion, check the source data for duplicates. You can use SQL queries or data profiling tools to identify any duplicate records that may violate unique constraints.
  
  
  Data Cleansing: Clean the data to remove duplicates or modify them to ensure that they comply with the unique index constraints. This may involve merging records, changing values, or removing unnecessary duplicates.
  
  
  Review Mapping Logic: Ensure that the mapping logic used during the conversion process maintains the uniqueness of the data. Adjust the transformation rules if necessary.
  
  
  Adjust Indexes Temporarily: In some cases, you may consider temporarily dropping the unique indexes during the data load and then re-creating them afterward. However, this should be done with caution and a thorough understanding of the implications.
  
  
  Batch Processing: If the error is due to concurrency issues, consider processing the data in smaller batches to minimize the risk of conflicts.
  
  
  Error Logging: Implement error logging to capture details about the records that caused the error. This can help in diagnosing the issue and making necessary adjustments.
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to UGMD8123 for any specific patches or updates that may address this issue.
  Data Migration Tools: If you are using SAP Data Services or other migration tools, refer to their documentation for best practices on handling unique indexes during data migration.
  Testing: Always perform thorough testing in a non-production environment before executing data migrations or conversions in a live system.
  
  By following these steps, you should be able to resolve the UGMD8123 error and ensure a successful data conversion or migration process.