How To Fix RSDS209 - Duplicate data records returned; indicator is not checked

SAP Error Message - Details

• Message type: E = Error

• Message class: RSDS - New DataSource

• Message number: 209

• Message text: Duplicate data records returned; indicator is not checked

What causes this issue?

The <DS><DS:DE.RSDUPREC>Delivery of Duplicate Data Records</></> flag is
set for the DataSource. It is not a master data or text DataSource,
however. BW therefore has no checks or special handling for duplicate
data records.

System Response

The system will ignore this flag.

How to fix this error?

Check yourself in the conversion, preferably in the end routine, that no
duplicate data records have been posted.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message RSDS209 - Duplicate data records returned; indicator is not checked ?

  The SAP error message RSDS209 indicates that a query or data extraction process has returned duplicate data records, and the "Remove Duplicate Records" indicator is not checked. This can occur in various scenarios, particularly when working with SAP BW (Business Warehouse) or SAP HANA.
  Cause:
  
  Data Model Design: The underlying data model may have duplicates due to how data is structured or loaded into the system. This can happen if the same data is loaded multiple times without proper deduplication.
  Query Configuration: The query or data extraction settings may not be configured to handle duplicates, leading to multiple records being returned for the same entity.
  Join Conditions: If the query involves multiple tables, improper join conditions can lead to Cartesian products, resulting in duplicate records.
  Data Source Issues: The data source itself may contain duplicate entries, which are then reflected in the query results.
  
  Solution:
  
  Check Data Source: Review the data source to ensure that it does not contain duplicate records. If duplicates exist, consider cleaning the data or adjusting the data load process to prevent duplicates.
  Adjust Query Settings: 
  
  If you want to keep duplicates, you can check the "Remove Duplicate Records" indicator in the query properties. This will filter out duplicate records from the results.
  If you need to analyze duplicates, consider modifying the query to include additional fields that can help differentiate records.
  
  
  Review Joins: If the query involves multiple tables, review the join conditions to ensure they are correctly defined to avoid unintended duplicates.
  Data Modeling: If the issue is systemic, consider revisiting the data model design to ensure that it is optimized for the intended reporting and analysis.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide guidance on best practices for handling duplicates in queries.
  Documentation: Review SAP BW or HANA documentation for best practices on data modeling, query design, and handling duplicates.
  Performance Considerations: Removing duplicates can impact performance, especially with large datasets. Ensure that the solution aligns with performance requirements.
  
  By addressing the underlying causes and adjusting the query settings, you can resolve the RSDS209 error and ensure that your data extraction processes yield the desired results.