How To Fix SDDL_PARSER_MSG289 - WITH HIERARCHY cannot be combined with UNION/UNION ALL

SAP Error Message - Details

• Message type: E = Error

• Message class: SDDL_PARSER_MSG - Message Class for DDL Parser

• Message number: 289

• Message text: WITH HIERARCHY cannot be combined with UNION/UNION ALL

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SDDL_PARSER_MSG289 - WITH HIERARCHY cannot be combined with UNION/UNION ALL ?

  The SAP error message SDDL_PARSER_MSG289 typically occurs when there is an issue with the way a query is structured, particularly when using the HIERARCHY keyword in conjunction with UNION or UNION ALL operations. This error indicates that the hierarchy cannot be combined with these operations due to the way the data is being aggregated or structured.
  Cause:
  
  
  Hierarchy Usage: The error arises when you attempt to use a hierarchy in a query that also includes a UNION or UNION ALL operation. Hierarchies in SAP are designed to represent a structured relationship between data elements, and combining them with UNION operations can lead to ambiguity in how the data should be merged.
  
  
  Query Structure: The structure of the query may not be compatible with the requirements of the hierarchy. For example, if the hierarchy is defined in a way that expects a specific data format or structure, and the UNION operation introduces a different structure, this can lead to the error.
  
  
  Solution:
  
  
  Review Query Structure: Check the SQL query or the data source definition to ensure that the hierarchy is not being combined with UNION or UNION ALL. If you need to combine results from different sources, consider restructuring the query to avoid using hierarchies in conjunction with these operations.
  
  
  Separate Queries: If you need to retrieve data from multiple sources that involve hierarchies, consider running separate queries for each source and then combining the results in your application logic rather than in the SQL query itself.
  
  
  Use Alternative Approaches: If you need to aggregate data from different hierarchies, consider using JOIN operations instead of UNION. This may allow you to maintain the hierarchical structure without running into the limitations imposed by UNION operations.
  
  
  Check Documentation: Refer to the SAP documentation for the specific version you are using to understand the limitations and best practices for working with hierarchies and unions.
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional context on working with hierarchies and unions.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  Performance Considerations: Be aware that restructuring queries can have performance implications, so always test the performance of your new query structure.
  
  By following these steps, you should be able to resolve the SDDL_PARSER_MSG289 error and successfully work with hierarchies in your SAP queries.