How To Fix RS_ADSO_MODEL156 - Having both a hash definition and a key definition is not supported

SAP Error Message - Details

• Message type: E = Error

• Message class: RS_ADSO_MODEL - Messages related to the Datastore Object Backend

• Message number: 156

• Message text: Having both a hash definition and a key definition is not supported

Self-Explanatory Message

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• What is the cause and solution for SAP error message RS_ADSO_MODEL156 - Having both a hash definition and a key definition is not supported ?

  The SAP error message RS_ADSO_MODEL156, which states "Having both a hash definition and a key definition is not supported," typically occurs in the context of SAP BW/4HANA or SAP BW on HANA when working with Advanced DataStore Objects (ADSO). This error indicates a conflict in the data model configuration where both a hash key and a key definition are being used simultaneously, which is not allowed.
  Cause:
  
  Conflicting Key Definitions: The error arises when you have defined both a hash key and a traditional key in the same ADSO. A hash key is used for performance optimization, while a key definition is used for data integrity and uniqueness.
  Model Configuration: The configuration of the ADSO might have been set up incorrectly, leading to the inclusion of both types of keys.
  
  Solution:
  To resolve this error, you need to adjust the key definitions in your ADSO model:
  
  
  Review Key Definitions:
  
  Go to the ADSO model in the SAP BW modeling tools.
  Check the key definitions and identify if both a hash key and a key definition are present.
  
  
  
  Remove Conflicting Definitions:
  
  If you find both definitions, decide which one you want to keep based on your data modeling requirements.
  Remove either the hash key or the key definition to ensure that only one type of key is defined.
  
  
  
  Revalidate the Model:
  
  After making the necessary changes, revalidate the ADSO model to ensure that the error is resolved.
  Activate the ADSO model again if required.
  
  
  
  Test the Changes:
  
  Run a test load or query to ensure that the ADSO is functioning correctly without the error.
  
  
  
  Related Information:
  
  Hash Key: A hash key is used for performance optimization in data retrieval and is typically used in scenarios where fast access to data is required.
  Key Definition: A key definition ensures the uniqueness of records in the data model and is essential for maintaining data integrity.
  SAP Documentation: Refer to the official SAP Help Portal or SAP Notes for detailed information on ADSO configurations and best practices.
  SAP Community: Engage with the SAP Community forums for discussions and solutions related to similar issues faced by other users.
  
  By following these steps, you should be able to resolve the RS_ADSO_MODEL156 error and ensure that your ADSO is correctly configured.