How To Fix SDDL_PARSER_MSG128 - The view & contains a UNION and cannot be extended

SAP Error Message - Details

• Message type: E = Error

• Message class: SDDL_PARSER_MSG - Message Class for DDL Parser

• Message number: 128

• Message text: The view & contains a UNION and cannot be extended

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SDDL_PARSER_MSG128 - The view & contains a UNION and cannot be extended ?

  The SAP error message SDDL_PARSER_MSG128 indicates that you are trying to extend a view that contains a UNION operation. In SAP, views that are defined with a UNION cannot be extended because the structure of the data returned by a UNION is not compatible with the extension mechanism.
  Cause:
  The primary cause of this error is that the view you are attempting to extend is defined using a UNION operation. A UNION combines the results of two or more SELECT statements into a single result set, and this structure does not allow for the addition of new fields or modifications through extensions.
  Solution:
  To resolve this error, you have a few options:
  
  
  Create a New View: Instead of trying to extend the existing view, you can create a new view that combines the necessary fields from the original view and any additional fields you need. This new view can be designed without a UNION or can be structured in a way that allows for extensions.
  
  
  Modify the Existing View: If you have access to the original view's definition and it is appropriate to do so, consider modifying the view to eliminate the UNION operation. This may involve restructuring the underlying queries or logic.
  
  
  Use a Different Approach: Depending on your requirements, you might consider using a different approach to achieve your goals, such as using a table or a different type of data structure that allows for extensions.
  
  
  Consult Documentation: Review the SAP documentation related to views and extensions to understand the limitations and best practices for working with views that contain UNION operations.
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific guidance or updates related to this error message. SAP frequently updates its knowledge base with solutions to common issues.
  SAP Community: Engage with the SAP Community forums where other users may have encountered similar issues and can provide insights or solutions.
  ABAP Development Guidelines: Familiarize yourself with ABAP development guidelines regarding views, especially those that involve complex SQL operations like UNION.
  
  By following these steps, you should be able to address the error and find a suitable workaround for your requirements.