How To Fix CFD_REGISTRY_CHECK202 - Union all operator must not be set in union branch of subview &1.

SAP Error Message - Details

• Message type: E = Error

• Message class: CFD_REGISTRY_CHECK - Custom Fields: Messages for Registry Check

• Message number: 202

• Message text: Union all operator must not be set in union branch of subview &1.

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CFD_REGISTRY_CHECK202 - Union all operator must not be set in union branch of subview &1. ?

  The SAP error message CFD_REGISTRY_CHECK202 indicates that there is an issue with the use of the "UNION ALL" operator in a subview definition within a Core Data Services (CDS) view. This error typically arises when the CDS view is incorrectly defined, particularly when it comes to the structure of the UNION operation.
  Cause:
  The error occurs because the "UNION ALL" operator is being used in a context where it is not allowed. In SAP CDS views, the UNION operation is used to combine the results of two or more SELECT statements. However, the use of "UNION ALL" is restricted in certain scenarios, particularly within subviews or when the structure of the views does not align correctly.
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Review the CDS View Definition: Check the definition of the CDS view where the error is occurring. Ensure that the "UNION ALL" operator is not being used in a subview context where it is not permitted.
  
  
  Modify the View Structure: If you need to use "UNION ALL", consider restructuring your views. You may need to create separate views for each part of the UNION and then combine them at a higher level if necessary.
  
  
  Check for Compatibility: Ensure that the fields being combined in the UNION operation have compatible data types and structures. The number of fields and their types must match across the SELECT statements.
  
  
  Use UNION Instead of UNION ALL: If the use of "UNION ALL" is not essential, consider using "UNION" instead, which eliminates duplicate records and may be more appropriate in certain contexts.
  
  
  Consult Documentation: Refer to the SAP documentation for Core Data Services to understand the limitations and best practices for using UNION operations in CDS views.
  
  
  Testing: After making changes, test the CDS view to ensure that it compiles and executes without errors.
  
  
  Related Information:
  
  Core Data Services (CDS): A framework for defining semantically rich data models in SAP systems.
  UNION vs. UNION ALL: "UNION" removes duplicate records, while "UNION ALL" includes all records, including duplicates.
  SAP Notes and Community: Check SAP Notes or the SAP Community for any known issues or additional guidance related to this error message.
  
  By following these steps, you should be able to resolve the CFD_REGISTRY_CHECK202 error and successfully define your CDS view.