How To Fix CFD_REGISTRY_CHECK203 - Group by clause 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: 203

• Message text: Group by clause 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_CHECK203 - Group by clause must not be set in union branch of subview &1. ?

  The SAP error message CFD_REGISTRY_CHECK203 indicates that there is an issue with the use of the GROUP BY clause in a union branch of a subview in your SAP system. This error typically arises when you are trying to create or modify a CDS (Core Data Services) view that involves unions, and you have incorrectly applied a GROUP BY clause in one of the branches of the union.
  Cause:
  The error occurs because, in a union operation, all branches must have the same structure and semantics. The GROUP BY clause is not allowed in one of the branches of a union because it can lead to ambiguity in the result set. The SQL standard requires that all SELECT statements in a UNION must have the same number of columns and compatible data types, and using GROUP BY in one branch can violate this rule.
  Solution:
  To resolve this error, you should ensure that:
  
  
  Remove the GROUP BY Clause: If you have a GROUP BY clause in one of the branches of the union, you need to remove it. Instead, you can perform the aggregation in a separate view or subquery before performing the union.
  
  
  Ensure Consistency: Make sure that all branches of the union have the same structure (i.e., the same number of columns and compatible data types). If you need to aggregate data, consider doing it outside of the union.
  
  
  Use Subqueries: If you need to aggregate data, consider using subqueries to perform the aggregation first and then union the results of those subqueries.
  
  
  Example:
  Here’s a simplified example to illustrate the point:
  Incorrect Example:
  SELECT field1, SUM(field2) AS total
  FROM table1
  GROUP BY field1
  UNION
  SELECT field1, field2
  FROM table2
  This will trigger the CFD_REGISTRY_CHECK203 error because the first branch has a GROUP BY clause while the second does not.
  Correct Example:
  SELECT field1, SUM(field2) AS total
  FROM table1
  GROUP BY field1
  UNION
  SELECT field1, SUM(field2) AS total
  FROM table2
  GROUP BY field1
  In this corrected example, both branches have a GROUP BY clause, ensuring consistency.
  Related Information:
  
  CDS Views: Core Data Services (CDS) views are a way to define semantically rich data models in SAP. Understanding how to structure these views is crucial for avoiding errors.
  SQL Standards: Familiarity with SQL standards regarding unions and aggregations can help prevent similar issues in the future.
  SAP Documentation: Refer to the official SAP documentation for more details on creating CDS views and the rules governing unions and aggregations.
  
  By following these guidelines, you should be able to resolve the CFD_REGISTRY_CHECK203 error and successfully create your CDS view.