How To Fix SBO_MSG004 - Number of key fields are different in CDS view and key structure

SAP Error Message - Details

• Message type: E = Error

• Message class: SBO_MSG - Message Class for Class CL_SBO_BODATAMANAGE

• Message number: 004

• Message text: Number of key fields are different in CDS view and key structure

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SBO_MSG004 - Number of key fields are different in CDS view and key structure ?

  The SAP error message SBO_MSG004, which states "Number of key fields are different in CDS view and key structure," typically occurs when there is a mismatch between the key fields defined in a Core Data Services (CDS) view and the key fields defined in the associated key structure. This can happen during the creation or activation of a CDS view, especially when it is intended to be used in a context where a key structure is expected, such as in an OData service or when integrating with other SAP components.
  Cause
  The error is caused by one of the following reasons:
  
  Mismatch in Key Fields: The number of key fields defined in the CDS view does not match the number of key fields defined in the key structure that is being referenced.
  Incorrect Annotations: The annotations in the CDS view may not correctly specify the key fields.
  Changes in Data Model: If there have been recent changes to the underlying data model or key structure, the CDS view may not have been updated accordingly.
  
  Solution
  To resolve this error, you can follow these steps:
  
  
  Check Key Fields in CDS View:
  
  Open the CDS view in the ABAP Development Tools (ADT) or the relevant development environment.
  Verify the key fields defined in the CDS view. Ensure that they are correctly specified using the @Key annotation.
  
  
  
  Check Key Structure:
  
  Identify the key structure that the CDS view is supposed to align with.
  Check the definition of the key structure to see how many key fields it has and what they are.
  
  
  
  Align Key Fields:
  
  Ensure that the number of key fields and their definitions in the CDS view match those in the key structure.
  If necessary, modify the CDS view to add or remove key fields to achieve alignment.
  
  
  
  Re-activate the CDS View:
  
  After making the necessary changes, re-activate the CDS view to see if the error persists.
  
  
  
  Check for Dependencies:
  
  If the CDS view is used in other objects (like OData services), ensure that those objects are also updated to reflect any changes made to the CDS view.
  
  
  
  Consult Documentation:
  
  If you are unsure about the correct key fields or structure, refer to the SAP documentation or consult with a colleague who has experience with the specific data model.
  
  
  
  Related Information
  
  CDS Views: Core Data Services (CDS) is a framework for defining semantically rich data models in SAP. Understanding how to define key fields and annotations is crucial for creating effective CDS views.
  Key Structures: Key structures are used in various SAP applications to define unique identifiers for data records. They are often used in conjunction with CDS views for data retrieval and manipulation.
  SAP Notes and Community: If the issue persists, consider checking SAP Notes or the SAP Community for similar issues and solutions shared by other users.
  
  By following these steps, you should be able to resolve the SBO_MSG004 error and ensure that your CDS view is correctly defined in relation to its key structure.