How To Fix CFD_REGISTRY_CHECK220 - Description fields not supported for CDS view &1 (due to group by clause)

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 220

• Message text: Description fields not supported for CDS view &1 (due to group by clause)

What causes this issue?

Description fields are not supported in consumption view <(>&<)>1
(Annotation @VDM.viewType: #CONSUMPTION), which is used for oData
exposure (Annotation @OData.publish: true) due to the contained group by
clause.

System Response

All code like custom fields will have no additional description fields
within the resulting oData service.

How to fix this error?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CFD_REGISTRY_CHECK220 - Description fields not supported for CDS view &1 (due to group by clause) ?

  The SAP error message CFD_REGISTRY_CHECK220 indicates that there is an issue with the use of description fields in a Core Data Services (CDS) view when a GROUP BY clause is present. This error typically arises when you attempt to include fields in the SELECT list that are not part of the aggregation or grouping, which is not allowed in SQL.
  Cause:
  The error occurs because:
  
  Description Fields: You are trying to select description fields (e.g., text fields) that are not included in the GROUP BY clause or are not aggregated.
  SQL Aggregation Rules: SQL requires that all selected fields in a grouped query must either be included in the GROUP BY clause or be aggregated using functions like SUM(), COUNT(), etc.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Modify the CDS View:
  
  Ensure that all fields in the SELECT list are either included in the GROUP BY clause or are aggregated.
  If you need to include description fields, add them to the GROUP BY clause.
  
  Example:
  SELECT field1, field2, description_field
  FROM your_table
  GROUP BY field1, field2, description_field
  
  
  Use Aggregation:
  
  If you do not need the description field to be grouped, consider using an aggregation function on it, if applicable.
  
  
  
  Review the Business Logic:
  
  Assess whether the inclusion of the description field is necessary for your business logic. If it is not, you may choose to exclude it from the SELECT list.
  
  
  
  Check for Annotations:
  
  If you are using annotations in your CDS view, ensure that they are correctly defined and do not conflict with the grouping logic.
  
  
  
  Related Information:
  
  CDS Views: Core Data Services (CDS) is a framework for defining semantically rich data models in SAP. Understanding how to properly structure CDS views is crucial for avoiding such errors.
  SQL Grouping: Familiarize yourself with SQL aggregation and grouping rules, as they are fundamental to writing effective queries.
  SAP Documentation: Refer to the official SAP documentation for more details on CDS views and SQL syntax to ensure compliance with best practices.
  
  By following these steps, you should be able to resolve the CFD_REGISTRY_CHECK220 error and successfully execute your CDS view.