How To Fix WZRE_PRX008 - No proxy class / method for confirmation message is existing

SAP Error Message - Details

• Message type: E = Error

• Message class: WZRE_PRX - SOA messages from proxy implementations

• Message number: 008

• Message text: No proxy class / method for confirmation message is existing

Self-Explanatory Message

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• What is the cause and solution for SAP error message WZRE_PRX008 - No proxy class / method for confirmation message is existing ?

  SAP Error Message:
  
  WZRE_PRX008 No proxy class / method for confirmation message is existing
  
  Cause
  This error occurs in SAP Process Integration (PI) / Process Orchestration (PO) scenarios when the system tries to send or process a confirmation message (usually an asynchronous response or acknowledgment) but cannot find the corresponding proxy class or method generated for that confirmation message.
  In other words, the runtime expects a proxy class and method to handle the confirmation message, but these are missing because:
  
  The proxy classes were not generated for the confirmation message interface.
  The confirmation message interface is not defined or linked properly in the Enterprise Services Repository (ESR).
  The inbound or outbound interface mapping for the confirmation message is missing or incomplete.
  The proxy runtime artifacts are not deployed or are outdated.
  
  
  When does it typically occur?
  
  During asynchronous service calls where a confirmation or response message is expected.
  When using SAP PI/PO with proxy-based communication and the confirmation message interface is not properly generated or deployed.
  After changes in the service interface or message types without regenerating and redeploying proxy classes.
  
  
  Solution
  
  
  Check the Service Interface:
  
  Verify that the confirmation message interface (response or acknowledgment) is defined in the ESR.
  Ensure that the interface is correctly linked to the request message interface.
  
  
  
  Generate Proxy Classes:
  
  In the SAP backend system (e.g., ECC or S/4HANA), use transaction SPROXY to generate the proxy classes for the confirmation message interface.
  Make sure to generate both request and confirmation proxy classes if applicable.
  
  
  
  Deploy Proxy Runtime Artifacts:
  
  After generating proxy classes, ensure that the runtime artifacts are properly deployed.
  If using SAP NetWeaver Developer Studio or Eclipse, check that the generated classes are included in the deployed runtime.
  
  
  
  Check Integration Directory Configuration:
  
  Verify that the communication channels and operation mappings are correctly configured for the confirmation message.
  Ensure that the interface mapping includes the confirmation message interface.
  
  
  
  Rebuild and Redeploy:
  
  If changes were made to the ESR or proxy classes, rebuild and redeploy the relevant objects.
  Restart the relevant services if necessary.
  
  
  
  Check for Transport Issues:
  
  Sometimes transports may miss proxy classes or runtime artifacts. Verify that all necessary objects are transported to the target system.
  
  
  
  
  Related Information
  
  Transaction SPROXY: Used to generate and maintain proxy classes.
  Enterprise Services Repository (ESR): Where service interfaces and message types are defined.
  Integration Directory: Where communication channels and interface mappings are configured.
  Proxy Runtime: The runtime environment where generated proxy classes are executed.
  SAP Note references (if applicable) can be checked for specific versions or patches.
  
  
  Summary
  
  
  
  Aspect
  Details
  
  
  
  
  Cause
  Missing proxy class/method for confirmation message due to non-generation or deployment
  
  
  Solution
  Generate proxy classes via SPROXY, deploy runtime artifacts, verify ESR and ID config
  
  
  Where to check
  ESR, SPROXY transaction, Integration Directory, runtime deployment
  
  
  Typical scenario
  Asynchronous service calls expecting confirmation messages
  
  
  
  
  If you provide more details about your scenario (e.g., system version, interface type, synchronous/asynchronous), I can help with more specific steps.