How To Fix SD_CDS_ENTITY019 - @AbapCatalog.preserveKey: true missing for entity in BO structure

SAP Error Message - Details

• Message type: E = Error

• Message class: SD_CDS_ENTITY - Messages for STOBS/entities

• Message number: 019

• Message text: @AbapCatalog.preserveKey: true missing for entity in BO structure

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SD_CDS_ENTITY019 - @AbapCatalog.preserveKey: true missing for entity in BO structure ?

  The SAP error message SD_CDS_ENTITY019 @AbapCatalog.preserveKey: true missing for entity in BO structure typically occurs in the context of Core Data Services (CDS) views in SAP, particularly when dealing with Business Objects (BO) in the SAP S/4HANA environment. This error indicates that a key preservation annotation is missing for a specific entity in the CDS view definition.
  Cause:
  The error arises when a CDS view is defined without the necessary @AbapCatalog.preserveKey: true annotation for an entity that requires key preservation. Key preservation is essential for ensuring that the keys of the underlying database tables are maintained when the CDS view is used in various operations, such as data retrieval or updates.
  Solution:
  To resolve this error, you need to add the @AbapCatalog.preserveKey: true annotation to the relevant entity in your CDS view definition. Here’s how you can do that:
  
  
  Open the CDS View Definition: Access the ABAP Development Tools (ADT) in Eclipse or the relevant transaction in the SAP GUI where the CDS view is defined.
  
  
  Locate the Entity: Find the entity that is causing the error. This is typically a table or a structure that is part of your CDS view.
  
  
  Add the Annotation: Modify the entity definition to include the @AbapCatalog.preserveKey: true annotation. It should look something like this:
  @AbapCatalog.preserveKey: true
  define view Your_CDS_View as select from Your_Table
  {
      key Your_Key_Field,
      Your_Other_Fields
  }
  
  
  Activate the CDS View: After making the changes, activate the CDS view to apply the modifications.
  
  
  Test the Changes: Execute the CDS view or any related operations to ensure that the error is resolved.
  
  
  Related Information:
  
  
  Key Preservation: This concept is crucial in scenarios where the CDS view is used for data manipulation (e.g., in OData services). It ensures that the keys of the underlying tables are preserved, which is important for maintaining data integrity.
  
  
  CDS Annotations: Familiarize yourself with other CDS annotations that may be relevant to your use case, such as @AbapCatalog.sqlViewName, @AccessControl.authorizationCheck, etc.
  
  
  Documentation: Refer to the official SAP documentation on Core Data Services and annotations for more detailed information on how to define and manage CDS views effectively.
  
  
  Debugging: If you continue to encounter issues, consider using the ABAP debugger or transaction codes like SE11 (Data Dictionary) or SE80 (Object Navigator) to further investigate the structure and definitions of your CDS views and related entities.
  
  
  By following these steps, you should be able to resolve the SD_CDS_ENTITY019 error and ensure that your CDS view is correctly defined with key preservation.