How To Fix SIW379 - No proxy class could be determined for proxy interface &1

SAP Error Message - Details

• Message type: E = Error

• Message class: SIW - Service Implementation Workbench

• Message number: 379

• Message text: No proxy class could be determined for proxy interface &1

What causes this issue?

An inconsistency was detected with the ABAP proxy: to a give proxy
interface no proxy class could be determined.

System Response

The current action is aborted with an exception message.
If the action is the creation of a new project, the project will not be
established.

How to fix this error?

Go to the ABAP proxy (transaction SPROXY) and check it.
Generate the proxy if necessary.
Activate the proxy if is not active.
Verify that the proxy class is specified and active.
Verify that no other classes exist that implement the proxy interface
(e.g. after a replacement of the proxy class the former class must be
deleted).

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 SIW379 - No proxy class could be determined for proxy interface &1 ?

  The SAP error message SIW379 indicates that the system is unable to determine a proxy class for a specified proxy interface. This typically occurs in the context of SAP Process Integration (PI) or SAP Process Orchestration (PO) when dealing with web services or service-oriented architecture (SOA).
  Cause:
  
  Missing Proxy Class: The most common cause is that the proxy class for the specified proxy interface has not been generated or is missing in the system.
  Incorrect Configuration: There may be an issue with the configuration of the service or the proxy interface in the Enterprise Services Repository (ESR).
  Transport Issues: If the proxy class was recently transported from another system, there may have been issues during the transport process.
  Namespace Issues: The namespace of the proxy interface may not match the expected namespace for the proxy class.
  Authorization Issues: The user may not have the necessary authorizations to access the proxy class.
  
  Solution:
  
  
  Generate Proxy Classes: 
  
  Go to the SAP transaction SPROXY and check if the proxy class exists. If it does not, you may need to regenerate the proxy classes for the relevant interface.
  Use the "Generate" option in the context of the proxy interface to create the necessary proxy classes.
  
  
  
  Check Configuration:
  
  Verify the configuration in the ESR to ensure that the proxy interface is correctly defined and that the corresponding proxy class is linked.
  Ensure that the service is properly defined in the Integration Directory.
  
  
  
  Transport Check:
  
  If the proxy class was transported, check the transport logs for any errors or issues that may have occurred during the transport process.
  Ensure that all necessary objects were included in the transport request.
  
  
  
  Namespace Verification:
  
  Confirm that the namespace of the proxy interface matches the expected namespace for the proxy class. If there is a mismatch, you may need to adjust the configuration.
  
  
  
  Authorization Check:
  
  Ensure that the user has the necessary authorizations to access the proxy class. You may need to check the roles and authorizations assigned to the user.
  
  
  
  System Restart: In some cases, a system restart may help resolve temporary issues related to caching or system state.
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  Documentation: Review the SAP documentation related to proxy generation and web service configuration for more detailed guidance.
  Community Forums: Consider searching or posting in SAP community forums for insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to identify and resolve the issue related to the SAP error message SIW379.