How To Fix DMC_RT_MSG100 - Duplicate keys for table &1, portion &2

SAP Error Message - Details

• Message type: E = Error

• Message class: DMC_RT_MSG - DMC: Runtime Object Messages

• Message number: 100

• Message text: Duplicate keys for table &1, portion &2

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DMC_RT_MSG100 - Duplicate keys for table &1, portion &2 ?

  The SAP error message DMC_RT_MSG100 indicates that there are duplicate keys in a specific table during a data migration or data transfer process. This error typically arises in the context of SAP Data Migration Cockpit (DMC) or similar data handling scenarios where unique keys are expected for records in a table.
  Cause:
  
  Duplicate Records: The most common cause is that the source data contains duplicate records for the specified key fields. This can happen if the data extraction process did not filter out duplicates or if the source system has inherent data quality issues.
  Incorrect Mapping: If the mapping of fields from the source to the target table is not correctly defined, it may lead to the generation of duplicate keys.
  Data Transformation Issues: During the transformation phase, if the logic applied to create unique keys is flawed, it can result in duplicates.
  Concurrency Issues: If multiple processes are trying to insert records into the same table simultaneously, it may lead to key conflicts.
  
  Solution:
  
  Identify Duplicates: Review the source data to identify and resolve any duplicate records. You can use SQL queries or data profiling tools to find duplicates based on the key fields.
  Data Cleansing: Cleanse the data to ensure that only unique records are present. This may involve removing duplicates, merging records, or adjusting the data to ensure uniqueness.
  Check Mapping: Verify the mapping configuration in the DMC to ensure that the key fields are correctly defined and that there are no overlaps that could cause duplicates.
  Adjust Transformation Logic: If applicable, review and adjust the transformation logic to ensure that it generates unique keys for the target table.
  Batch Processing: If the error is due to concurrency, consider processing the data in smaller batches or implementing locking mechanisms to prevent simultaneous inserts.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to the DMC and this specific error message.
  Data Migration Cockpit Documentation: Review the official SAP documentation for the Data Migration Cockpit for best practices and guidelines on handling data migration.
  Data Quality Tools: Consider using data quality tools to assess and improve the quality of your source data before migration.
  Testing: After making changes, conduct thorough testing to ensure that the issue is resolved and that no new issues have been introduced.
  
  By addressing the root cause of the duplicates and ensuring that the data is clean and correctly mapped, you should be able to resolve the DMC_RT_MSG100 error.