How To Fix RSDS027 - Field name &1 of segment &2 exists multiple times

SAP Error Message - Details

• Message type: E = Error

• Message class: RSDS - New DataSource

• Message number: 027

• Message text: Field name &1 of segment &2 exists multiple times

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message RSDS027 - Field name &1 of segment &2 exists multiple times ?

  The SAP error message RSDS027 indicates that there is a problem with the data source definition in SAP BW (Business Warehouse) or SAP BI (Business Intelligence). Specifically, it means that a field name in a segment of a data source is defined multiple times, which can lead to ambiguity and confusion when processing data.
  Cause:
  The error typically arises from one of the following situations:
  
  Duplicate Field Definitions: The same field name is defined more than once within the same segment of the data source.
  Incorrect Data Source Configuration: The data source may have been incorrectly configured, leading to overlapping field names.
  Changes in Data Structure: If the underlying data structure has changed (e.g., changes in the source system), it may result in duplicate field names being pulled into the data source.
  
  Solution:
  To resolve the RSDS027 error, you can follow these steps:
  
  
  Check Data Source Definition:
  
  Go to the Data Source in the SAP BW system (transaction code RSA1).
  Navigate to the relevant Data Source and check the field definitions in the segments.
  Look for any duplicate field names within the same segment.
  
  
  
  Modify Field Names:
  
  If you find duplicate field names, you will need to rename one of the fields to ensure that each field name is unique within the segment.
  Save the changes and activate the Data Source.
  
  
  
  Recheck Data Source:
  
  After making changes, recheck the Data Source to ensure that the error no longer appears.
  You may also want to test the data extraction to confirm that it works as expected.
  
  
  
  Check Source System:
  
  If the issue persists, check the source system for any changes that may have led to the duplication of field names.
  Ensure that the data structure in the source system is consistent with the definitions in the BW system.
  
  
  
  Transport Changes:
  
  If you are working in a development environment, ensure that any changes made are transported to the production environment properly.
  
  
  
  Related Information:
  
  Transaction Codes: RSA1 (Data Warehousing Workbench), RSA3 (Data Source Test), and RSO2 (Data Source Maintenance).
  Documentation: Refer to SAP Help documentation for more details on Data Source configuration and troubleshooting.
  SAP Notes: Check for any relevant SAP Notes that may address specific issues related to RSDS027 or data source configuration.
  
  By following these steps, you should be able to resolve the RSDS027 error and ensure that your data source is correctly configured without duplicate field names.