How To Fix RSDD836 - Table &1 contains several entries with an identical key

SAP Error Message - Details

• Message type: E = Error

• Message class: RSDD - Message class for data manager

• Message number: 836

• Message text: Table &1 contains several entries with an identical key

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message RSDD836 - Table &1 contains several entries with an identical key ?

  The SAP error message RSDD836 indicates that there are multiple entries in a table that have the same key, which violates the uniqueness constraint expected by the system. This error typically occurs in the context of SAP BW (Business Warehouse) when dealing with InfoObjects, InfoProviders, or other data structures that require unique keys.
  Cause:
  
  Duplicate Data: The most common cause of this error is the presence of duplicate records in the underlying data source or during the data loading process. This can happen due to incorrect data extraction, transformation, or loading (ETL) processes.
  Incorrect Data Modeling: The data model may not be correctly defined, leading to situations where the same key is generated for different records.
  Data Source Issues: The data source from which the data is being extracted may contain duplicates, or the extraction logic may not be filtering out duplicates properly.
  
  Solution:
  
  
  Identify Duplicates: 
  
  Use SQL queries or SAP BW tools to identify the duplicate entries in the table mentioned in the error message. You can run a query to count occurrences of each key and find duplicates.
  Example SQL query:
  SELECT key_column, COUNT(*)
  FROM your_table
  GROUP BY key_column
  HAVING COUNT(*) > 1;
  
  
  
  
  Data Cleansing: 
  
  Once duplicates are identified, you need to cleanse the data. This may involve removing duplicates from the source system or adjusting the ETL process to ensure that duplicates are not loaded into the BW system.
  If duplicates are valid in the source but not in the BW context, consider modifying the data model to accommodate them (e.g., by adding additional distinguishing attributes).
  
  
  
  Adjust Data Load Process: 
  
  Review the data load process to ensure that it includes proper checks for duplicates. This may involve modifying the transformation rules or using data quality tools to filter out duplicates before they are loaded into the BW system.
  
  
  
  Reprocess Data: 
  
  After addressing the duplicates, reprocess the data load to ensure that the table is populated correctly without duplicates.
  
  
  
  Check Data Model: 
  
  Review the data model to ensure that it is designed correctly. Ensure that the keys defined in the InfoObjects or InfoProviders are appropriate and that they enforce uniqueness as required.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to the specific error message for any patches or updates that may address known issues.
  Data Modeling Best Practices: Familiarize yourself with best practices for data modeling in SAP BW to avoid similar issues in the future.
  Monitoring and Alerts: Set up monitoring and alerts for data loads to catch issues early before they propagate into the BW system.
  
  By following these steps, you should be able to resolve the RSDD836 error and ensure that your data is loaded correctly into SAP BW without duplicates.