How To Fix WES_OUTBOUND029 - Class &1 does not implement interface &2

SAP Error Message - Details

• Message type: E = Error

• Message class: WES_OUTBOUND - Messages for Outbound Services

• Message number: 029

• Message text: Class &1 does not implement interface &2

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WES_OUTBOUND029 - Class &1 does not implement interface &2 ?

  Certainly! Here's a detailed explanation for the SAP error message:
  
  SAP Error Message:
  WES_OUTBOUND029 Class &1 does not implement interface &2
  
  Cause:
  This error occurs when a class that is expected to implement a specific interface does not actually implement it. In SAP, interfaces define a set of methods that a class must implement. If a class is assigned or used in a context where an interface implementation is required, but the class does not implement that interface, this error is raised.
  In the context of SAP PI/PO (Process Integration / Process Orchestration) or SAP middleware, this often happens when configuring outbound processing or adapter modules where a class is expected to implement a certain interface (e.g., for message processing, adapter modules, or user-exits).
  
  Explanation:
  
  &1 = The name of the class that is being checked.
  &2 = The name of the interface that the class is expected to implement.
  
  The system checks if the class &1 implements the interface &2. If not, it throws this error.
  
  Typical Scenario:
  
  You have configured an outbound processing step or adapter module.
  The configuration expects a class that implements a certain interface (e.g., IF_WES_OUTBOUND or any other interface).
  The class assigned does not implement the required interface.
  When the system tries to instantiate or use the class as the interface type, it fails.
  
  
  Solution:
  
  
  Check the Class Implementation:
  
  Go to transaction SE24 (Class Builder).
  Enter the class name &1.
  Check the "Interfaces" tab to see if the class implements the interface &2.
  
  
  
  Implement the Interface:
  
  If the class does not implement the interface, you need to either:
  
  Modify the class to implement the required interface.
  Or use a different class that already implements the interface.
  
  
  
  
  
  Adjust Configuration:
  
  If the class is assigned in configuration (e.g., in adapter module configuration, user-exit, or enhancement), ensure that the class assigned is the correct one that implements the interface.
  
  
  
  Recompile and Activate:
  
  After implementing the interface or changing the class, recompile and activate the class.
  
  
  
  Test the Scenario:
  
  Run the outbound process again to verify that the error is resolved.
  
  
  
  
  Related Information:
  
  Transaction SE24: Class Builder to check and modify classes and interfaces.
  Interfaces in ABAP: Interfaces define method signatures that classes must implement.
  SAP PI/PO Adapter Modules: Often require classes implementing specific interfaces for processing.
  Common Interfaces: For outbound processing, interfaces like IF_WES_OUTBOUND or custom interfaces might be required.
  Error Context: This error is common in custom developments or when integrating third-party classes.
  
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Error
  Class &1 does not implement interface &2
  
  
  Cause
  Class assigned does not implement required interface
  
  
  Solution
  Ensure class implements interface or assign correct class
  
  
  Tools
  SE24 (Class Builder), SE80 (Object Navigator)
  
  
  Context
  Outbound processing, adapter modules, user-exits
  
  
  
  
  If you provide the actual class and interface names, I can help you with more specific guidance.