How To Fix SD_CDS_ENTITY038 - A key field definition is required in selection list

SAP Error Message - Details

• Message type: E = Error

• Message class: SD_CDS_ENTITY - Messages for STOBS/entities

• Message number: 038

• Message text: A key field definition is required in selection list

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message SD_CDS_ENTITY038 - A key field definition is required in selection list ?

  The SAP error message SD_CDS_ENTITY038 indicates that a key field definition is required in the selection list for a Core Data Service (CDS) view. This error typically arises when you are trying to execute a query or report that relies on a CDS view, but the selection criteria do not include the necessary key fields.
  Cause:
  
  Missing Key Fields: The selection criteria for the CDS view do not include one or more key fields that are required for the query to execute properly.
  Incorrect Configuration: The CDS view may not be configured correctly, leading to the absence of key fields in the selection list.
  Data Model Changes: Changes in the underlying data model or the CDS view definition may have resulted in the removal or alteration of key fields.
  
  Solution:
  
  
  Check the CDS View Definition: Review the definition of the CDS view to identify which key fields are required. You can do this by using the ABAP Development Tools (ADT) in Eclipse or the transaction code SE11.
  
  
  Modify the Selection Criteria: Ensure that your selection criteria include all necessary key fields. You may need to adjust your query or report to include these fields.
  
  
  Consult Documentation: Refer to the documentation for the specific CDS view you are using to understand the required key fields and their significance.
  
  
  Test with Minimal Selection: If you are unsure which key fields are required, try executing the query with minimal selection criteria and gradually add fields until you identify the necessary key fields.
  
  
  Check for Updates: If the CDS view is part of a standard SAP application, check for any updates or notes from SAP that may address this issue.
  
  
  Contact SAP Support: If you are unable to resolve the issue, consider reaching out to SAP support for assistance, especially if this is a production issue.
  
  
  Related Information:
  
  CDS Views: Core Data Services are a way to define semantic data models in SAP. They allow for the creation of complex queries and data models that can be consumed by various applications.
  Key Fields: Key fields are essential for uniquely identifying records in a database table or view. They are crucial for ensuring data integrity and for performing operations like updates and deletes.
  Transaction Codes: Familiarize yourself with transaction codes like SE11 (Data Dictionary) and SE80 (Object Navigator) for exploring and managing CDS views.
  
  By following these steps, you should be able to identify and resolve the issue related to the error message SD_CDS_ENTITY038.