How To Fix RSDS124 - The language field &1 in segment &2 is not type 'LANG'

SAP Error Message - Details

• Message type: E = Error

• Message class: RSDS - New DataSource

• Message number: 124

• Message text: The language field &1 in segment &2 is not type 'LANG'

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message RSDS124 - The language field &1 in segment &2 is not type 'LANG' ?

  The SAP error message RSDS124 indicates that there is an issue with the language field in a specific segment of a DataSource. The error message states that the language field (denoted as &1) in the segment (denoted as &2) is not of the expected type 'LANG'. This typically occurs in the context of SAP BW (Business Warehouse) or when working with DataSources in SAP systems.
  Cause:
  
  Incorrect Field Definition: The field defined as the language field in the DataSource is not correctly set up to be of type 'LANG'. This could be due to a misconfiguration in the DataSource definition.
  DataSource Configuration: The DataSource may have been incorrectly configured, leading to a mismatch in expected data types.
  Data Extraction Issues: If the DataSource is extracting data from a source system, the source system may not be providing the language field in the expected format.
  
  Solution:
  
  
  Check DataSource Definition:
  
  Go to the DataSource in the SAP BW system (transaction code RSA1).
  Verify the field definitions in the DataSource. Ensure that the language field is defined as type 'LANG'.
  If it is not, you may need to adjust the DataSource definition to correct the field type.
  
  
  
  Adjust Field Mapping:
  
  If the DataSource is based on a table or view, check the underlying structure to ensure that the language field is correctly defined in the source system.
  If necessary, modify the DataSource to map the correct field from the source system.
  
  
  
  Re-activate the DataSource:
  
  After making changes to the DataSource definition, re-activate the DataSource to ensure that the changes take effect.
  
  
  
  Check for Updates:
  
  Ensure that your SAP system is up to date with the latest support packages and notes, as there may be fixes related to this issue.
  
  
  
  Consult SAP Notes:
  
  Search for relevant SAP Notes in the SAP Support Portal that may address this specific error message or provide additional guidance.
  
  
  
  Related Information:
  
  Transaction Codes: 
  
  RSA1: Data Warehousing Workbench
  RSO2: Maintain DataSource
  
  
  Data Types: In SAP, the 'LANG' data type is typically used for language fields, which are expected to contain language codes (e.g., 'EN' for English, 'DE' for German).
  SAP BW Documentation: Refer to SAP BW documentation for best practices on DataSource configuration and field definitions.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP Basis or BW team for further investigation or to reach out to SAP support for assistance.