How To Fix SADL_GTK_GEN037 - Wrong DPC class &1

SAP Error Message - Details

• Message type: E = Error

• Message class: SADL_GTK_GEN - SADL GTK Generation Messages

• Message number: 037

• Message text: Wrong DPC class &1

What causes this issue?

The assigned DPC class is invalid. This occurs when toggling the
Annotation @Analytics.query form true to false and vice versa in
combination with the Annotation @Odata.publish: true.

System Response

The generated Gateway objects have to be adjusted.

How to fix this error?

Remove the Annotation @OData.publish and activate the CDS view. The
activation will remove all generated Gateway Objects. Add again the
Annotation @OData.publish: true and activate the CDS view with the right
@Analytics.query Annotation.

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 SADL_GTK_GEN037 - Wrong DPC class &1 ?

  The SAP error message SADL_GTK_GEN037 with the description "Wrong DPC class &1" typically occurs in the context of the SAP Gateway and the SAP Data Model (SADL - SAP ABAP Data Layer). This error indicates that there is an issue with the Data Provider Class (DPC) that is being used in the service implementation.
  Cause:
  
  Incorrect DPC Class: The error usually arises when the DPC class specified in the service definition does not match the expected class or is not properly implemented.
  Service Configuration Issues: There may be misconfigurations in the service registration or the service definition in the SAP Gateway.
  Transport Issues: If the DPC class was recently transported from another system, it may not have been activated or may not exist in the target system.
  Namespace Issues: The DPC class might be in a different namespace than expected, leading to the system not being able to find it.
  
  Solution:
  
  Check DPC Class: Verify that the DPC class specified in the service definition is correct and exists in the system. You can do this by navigating to the service definition in transaction /IWFND/MAINT_SERVICE and checking the associated DPC class.
  Activate the DPC Class: If the DPC class exists but is not activated, activate it using transaction SE80 or SE24.
  Check Service Registration: Ensure that the service is properly registered and that all necessary components are activated. You can use transaction /IWFND/MAINT_SERVICE to check the status of the service.
  Review Transport Requests: If the DPC class was transported, ensure that all related objects were transported correctly and that there are no missing dependencies.
  Namespace Verification: Ensure that the DPC class is in the correct namespace and that there are no conflicts with other classes.
  
  Related Information:
  
  Transaction Codes:
  
  SE80: Object Navigator
  SE24: Class Builder
  /IWFND/MAINT_SERVICE: Service Maintenance
  
  
  Documentation: Refer to SAP Help documentation for SAP Gateway and SADL for more details on service implementation and troubleshooting.
  Debugging: If the issue persists, consider debugging the service call to identify where the DPC class is being referenced and what might be causing the mismatch.
  
  By following these steps, you should be able to resolve the SADL_GTK_GEN037 error and ensure that your SAP Gateway service is functioning correctly.