How To Fix CM_MDQLTYRULEMINING020 - Field value for field &2 of table &1 is not unique.

SAP Error Message - Details

• Message type: E = Error

• Message class: CM_MDQLTYRULEMINING - Messages for Rule Mining Run

• Message number: 020

• Message text: Field value for field &2 of table &1 is not unique.

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CM_MDQLTYRULEMINING020 - Field value for field &2 of table &1 is not unique. ?

  The SAP error message CM_MDQLTYRULEMINING020 indicates that there is a problem with the uniqueness of field values in a specific table. This error typically arises in the context of data quality rules or data mining processes where the system expects a unique value for a particular field, but it finds duplicates instead.
  Cause:
  The error occurs when:
  
  The field specified (denoted as &2) in the table (denoted as &1) contains duplicate values, which violates the uniqueness constraint expected by the data quality rule or mining process.
  This can happen due to data entry errors, data import processes, or issues with data integration where the same value is inadvertently entered multiple times.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Identify Duplicates:
  
  Use SQL queries or SAP transaction codes (like SE16 or SE11) to check the contents of the specified table and identify the duplicate values in the specified field.
  Example SQL query:
  SELECT field_name, COUNT(*)
  FROM table_name
  GROUP BY field_name
  HAVING COUNT(*) > 1;
  
  
  
  
  Data Cleansing:
  
  Once you identify the duplicates, you need to determine the appropriate action:
  
  Remove duplicates: If duplicates are not needed, you can delete the extra records.
  Merge records: If the duplicates contain different information, you may need to merge them into a single record.
  Update records: If the duplicates are due to incorrect data entry, update the records to ensure uniqueness.
  
  
  
  
  
  Implement Data Validation:
  
  To prevent future occurrences, consider implementing data validation rules during data entry or import processes to ensure that unique constraints are enforced.
  
  
  
  Re-run the Process:
  
  After resolving the duplicates, re-run the data quality rule or mining process that triggered the error to confirm that the issue has been resolved.
  
  
  
  Related Information:
  
  Transaction Codes: Use transaction codes like SE16 (Data Browser) or SE11 (Data Dictionary) to explore the table and field in question.
  Data Quality Management: Familiarize yourself with SAP's data quality management tools and best practices to maintain data integrity.
  Documentation: Refer to SAP documentation or support notes related to data quality rules and error handling for more detailed guidance.
  
  By following these steps, you should be able to resolve the CM_MDQLTYRULEMINING020 error and ensure that your data meets the required uniqueness constraints.