DDLS460 - View contains union: extension through extends is not possible

SAP Error Message - Details

• Message type: E = Error

• Message class: DDLS - For DDL source handling

• Message number: 460

• Message text: View contains union: extension through extends is not possible

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DDLS460 - View contains union: extension through extends is not possible ?

  The SAP error message DDLS460 indicates that there is an issue with a database view that contains a UNION operation. Specifically, the error states that the view cannot be extended using the EXTENDS keyword because it contains a UNION. This is a limitation in the way SAP handles views in the Data Dictionary.
  Cause:
  The error occurs when you attempt to extend a database view that is defined using a UNION operation. In SAP, views that are created with UNION cannot be extended because the structure of the resulting dataset is not uniform across all branches of the UNION. This means that the system cannot guarantee that the additional fields you want to add will be compatible with all parts of the UNION.
  Solution:
  To resolve this issue, you have a few options:
  
  
  Avoid Extending the View: If possible, do not attempt to extend the view. Instead, create a new view that includes the desired fields and combines the logic you need.
  
  
  Create a New View: If you need to add additional fields, consider creating a new view that combines the logic of the original view with the additional fields you require. This new view can be designed to meet your specific needs without using the EXTENDS keyword.
  
  
  Refactor the View: If you have control over the original view, consider refactoring it to avoid using UNION. This might involve restructuring the underlying tables or using alternative SQL constructs that do not lead to a UNION.
  
  
  Use a Different Approach: Depending on your requirements, you might also consider using a different approach, such as using a join instead of a UNION, if that fits your data model.
  
  
  Related Information:
  
  SAP Documentation: Check the SAP Help Portal for documentation on database views and the limitations associated with UNION operations.
  Data Dictionary (SE11): You can use transaction SE11 to view and modify the definitions of database views.
  SQL Syntax: Familiarize yourself with SQL syntax and the implications of using UNION versus JOIN operations in your database design.
  
  If you continue to face challenges, consider reaching out to your SAP Basis or ABAP development team for further assistance, as they may have additional insights based on your specific system configuration and requirements.