How To Fix MDG_MDF8123 - Conversion damages unique indexes

SAP Error Message - Details

• Message type: E = Error

• Message class: MDG_MDF8 - 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 MDG_MDF8123 - Conversion damages unique indexes ?

  The SAP error message MDG_MDF8123, which states "Conversion damages unique indexes," typically occurs in the context of Master Data Governance (MDG) when there is an issue with the uniqueness of data during a conversion process. This error indicates that the data being processed may violate the unique constraints defined in the database, which can lead to data integrity issues.
  Cause:
  
  Duplicate Data: The most common cause of this error is the presence of duplicate records in the data being processed. When the system attempts to convert or migrate data, it finds that the data violates the unique index constraints.
  Incorrect Mapping: If the mapping of fields during the data conversion is incorrect, it may lead to the creation of duplicate entries.
  Data Quality Issues: Poor data quality, such as inconsistent formats or missing values, can also lead to this error.
  Configuration Issues: Misconfiguration in the MDG setup or in the data model can lead to conflicts with unique indexes.
  
  Solution:
  
  Identify Duplicates: Before running the conversion, check the source data for duplicates. You can use SQL queries or data profiling tools to identify records that may violate uniqueness.
  Data Cleansing: Clean the data to remove duplicates or merge records as necessary. Ensure that the data adheres to the unique constraints defined in the target system.
  Review Mapping: Verify the mapping of fields during the conversion process. Ensure that the fields that are supposed to be unique are correctly mapped and populated.
  Adjust Unique Constraints: If necessary, review the unique constraints defined in the database. In some cases, it may be appropriate to adjust these constraints, but this should be done with caution and a clear understanding of the implications.
  Test in a Sandbox: Before executing the conversion in a production environment, test the process in a sandbox or development environment to ensure that the error does not occur.
  Consult Documentation: Review SAP documentation related to MDG and data conversion for any specific guidelines or best practices that may apply to your situation.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance on handling unique index violations in MDG.
  MDG Configuration: Familiarize yourself with the configuration settings in MDG, especially those related to data modeling and unique constraints.
  Data Governance Best Practices: Implement best practices for data governance to ensure data quality and integrity, which can help prevent similar issues in the future.
  
  If the problem persists after following these steps, consider reaching out to SAP support for further assistance, providing them with detailed information about the error and the context in which it occurs.