How To Fix ESH_ENG_CDSVAL_ES042 - '@Metadata.allowExtensions: true' is missing

SAP Error Message - Details

• Message type: E = Error

• Message class: ESH_ENG_CDSVAL_ES - ES-CDS/ABAP: Validation of domain @EnterpriseSearch

• Message number: 042

• Message text: '@Metadata.allowExtensions: true' is missing

What causes this issue?

'@Metadata.allowExtensions' should be annotated at the view.

System Response

Without this annotation, a customer cannot refine settings like the
rendering (@UI) or the ranking definition (@Consumption.ranking) on view
level.

How to fix this error?

Add the annotation on header level of the view.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message ESH_ENG_CDSVAL_ES042 - '@Metadata.allowExtensions: true' is missing ?

  The SAP error message ESH_ENG_CDSVAL_ES042 '@Metadata.allowExtensions: true' is missing typically occurs in the context of Core Data Services (CDS) views in SAP systems, particularly when working with the SAP HANA database. This error indicates that a specific annotation, @Metadata.allowExtensions, is not defined in the CDS view definition, which is required for certain functionalities, such as allowing extensions to the CDS view.
  Cause:
  The error is caused by the absence of the @Metadata.allowExtensions: true annotation in the CDS view definition. This annotation is necessary when you want to allow the extension of the CDS view, which is often required in scenarios where custom fields or additional logic need to be added to the existing view.
  Solution:
  To resolve this error, you need to modify the CDS view definition to include the required annotation. Here’s how you can do it:
  
  
  Open the CDS View Definition: Access the CDS view in the ABAP Development Tools (ADT) or the relevant development environment.
  
  
  Add the Annotation: Include the annotation @Metadata.allowExtensions: true at the beginning of your CDS view definition. It should look something like this:
  @AbapCatalog.sqlViewName: 'YOUR_SQL_VIEW_NAME'
  @AbapCatalog.compiler.compareFilter: true
  @Metadata.allowExtensions: true
  define view YOUR_CDS_VIEW_NAME
  as select from YOUR_TABLE
  {
      // Your field definitions
  }
  
  
  Activate the CDS View: After making the changes, activate the CDS view to ensure that the new annotation is recognized by the system.
  
  
  Test the Changes: After activation, test the functionality that was previously causing the error to ensure that the issue has been resolved.
  
  
  Related Information:
  
  CDS Views: Core Data Services (CDS) is a framework for defining semantically rich data models in SAP systems. CDS views can be extended to add custom fields or logic.
  Annotations: Annotations in CDS views provide metadata that can influence the behavior of the view, such as allowing extensions, defining UI properties, and more.
  SAP HANA: The error is particularly relevant in environments using SAP HANA as the database, where CDS views are commonly used for data modeling.
  
  If you continue to experience issues after adding the annotation, ensure that there are no other underlying problems with the CDS view or its dependencies. Additionally, consult the SAP documentation or support resources for further assistance.