How To Fix COM_DML_DATASET202 - Set type &: duplicate row key (&)

SAP Error Message - Details

• Message type: E = Error

• Message class: COM_DML_DATASET - MDF: Object Data

• Message number: 202

• Message text: Set type &: duplicate row key (&)

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message COM_DML_DATASET202 - Set type &: duplicate row key (&) ?

  The SAP error message COM_DML_DATASET202 with the description "Set type &: duplicate row key (&)" typically occurs when there is an attempt to insert or update a dataset in SAP that contains duplicate keys. This error is common in scenarios where data integrity is enforced, and each row in a dataset must have a unique key.
  Cause:
  
  
  Duplicate Data: The most common cause of this error is that the dataset being processed contains duplicate entries for a key that is supposed to be unique. This could happen due to:
  
  Data being imported from an external source that has duplicates.
  Errors in data processing logic that leads to the generation of duplicate keys.
  Manual data entry errors.
  
  
  
  Incorrect Configuration: Sometimes, the configuration of the dataset or the underlying database table may not be set up correctly to handle unique constraints.
  
  
  Concurrency Issues: If multiple processes are trying to insert or update the same dataset simultaneously, it may lead to conflicts and duplicate keys.
  
  
  Solution:
  
  
  Identify Duplicates: 
  
  Review the dataset to identify the rows that are causing the duplication. You can use SQL queries or data processing tools to find duplicates based on the key fields.
  
  
  
  Data Cleansing: 
  
  Remove or consolidate duplicate entries in the dataset. Ensure that each key is unique before attempting to insert or update the data again.
  
  
  
  Check Data Source: 
  
  If the data is being imported from an external source, ensure that the source data is clean and does not contain duplicates.
  
  
  
  Review Configuration: 
  
  Check the configuration of the dataset and the database table to ensure that the unique constraints are correctly defined.
  
  
  
  Implement Error Handling: 
  
  If the error is due to concurrent processes, consider implementing error handling or locking mechanisms to prevent simultaneous updates that could lead to duplicates.
  
  
  
  Testing: 
  
  After making changes, test the data insertion or update process in a development or test environment to ensure that the issue is resolved.
  
  
  
  Related Information:
  
  SAP Documentation: Refer to SAP's official documentation for more details on handling datasets and understanding unique constraints.
  Transaction Codes: Use transaction codes like SE11 (Data Dictionary) to check the structure of the database tables and their constraints.
  Debugging: If the issue persists, consider using debugging tools in SAP to trace the execution flow and identify where the duplicates are being introduced.
  
  By following these steps, you should be able to resolve the COM_DML_DATASET202 error and ensure that your dataset maintains the required uniqueness constraints.