How To Fix WZRE_PRX002 - Application processing class &1 for use case type &2 is not existing

SAP Error Message - Details

• Message type: E = Error

• Message class: WZRE_PRX - SOA messages from proxy implementations

• Message number: 002

• Message text: Application processing class &1 for use case type &2 is not existing

Self-Explanatory Message

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• What is the cause and solution for SAP error message WZRE_PRX002 - Application processing class &1 for use case type &2 is not existing ?

  Certainly! Here's a detailed explanation for the SAP error message:
  
  SAP Error Message:
  WZRE_PRX002: Application processing class &1 for use case type &2 is not existing
  
  Cause:
  This error occurs when the system tries to find an application processing class for a specific use case type but cannot find it in the configuration or repository. In SAP, use case types are linked to processing classes that handle specific business logic or processing steps. If the class is missing, incorrectly configured, or not assigned, the system throws this error.
  Typical scenarios include:
  
  Missing or incorrect configuration in the use case type to processing class assignment.
  The processing class has been deleted or not transported to the system.
  Custom developments where the class name is incorrectly specified.
  Incomplete or incorrect setup in the SAP Business Workflow or related modules.
  
  
  Solution:
  
  
  Check Configuration:
  
  Go to the customizing transaction where use case types are maintained (this depends on the module, e.g., SAP RE-FX, SAP CRM, or other).
  Verify that the use case type &2 is correctly assigned to an existing application processing class &1.
  
  
  
  Verify Class Existence:
  
  Use transaction SE24 (Class Builder) to check if the class &1 exists in the system.
  If the class does not exist, you need to create it or import it from the transport.
  
  
  
  Correct Assignment:
  
  If the class exists but is not assigned, assign it properly in the customizing.
  If the class name is wrong, correct the name in the configuration.
  
  
  
  Transport and Development:
  
  If this is a custom class, ensure it has been transported correctly to the system.
  Check for any recent changes or transports that might have removed or altered the class.
  
  
  
  Check OSS Notes:
  
  Search SAP OSS Notes for any known issues related to this error message and your SAP component/version.
  
  
  
  
  Related Information:
  
  
  This error is common in modules that use dynamic processing classes for handling business logic, such as SAP Real Estate Management (RE-FX), SAP CRM, or custom workflow scenarios.
  
  
  The error message variables:
  
  &1 = Application processing class name (e.g., CL_RE_FX_PROCESSING)
  &2 = Use case type (e.g., LEASE_CONTRACT)
  
  
  
  Transactions to check:
  
  SE24 - Class Builder (to check class existence)
  Module-specific customizing transactions (e.g., SPRO for configuration)
  SWO1 - Business Object Builder (if related to workflow/business objects)
  
  
  
  
  If you provide the exact module or context where this error occurs, I can give more precise instructions.
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Cause
  Missing or incorrect assignment of application processing class for a use case type.
  
  
  Solution
  Verify and correct the assignment; ensure the class exists in SE24; transport if missing.
  
  
  Related Info
  Check module-specific customizing; use SE24, SPRO, SWO1; consult SAP OSS Notes.
  
  
  
  
  If you need help with specific steps in your SAP system, please share the module or transaction where the error occurs.