How To Fix WES_OUTBOUND034 - Select an implementing class for filter &1

SAP Error Message - Details

• Message type: E = Error

• Message class: WES_OUTBOUND - Messages for Outbound Services

• Message number: 034

• Message text: Select an implementing class for filter &1

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WES_OUTBOUND034 - Select an implementing class for filter &1 ?

  Certainly! Here's a detailed explanation for the SAP error message:
  
  SAP Error Message:
  WES_OUTBOUND034: Select an implementing class for filter &1
  
  Cause:
  This error occurs in the context of SAP PI/PO (Process Integration / Process Orchestration) or SAP middleware scenarios where a filter is used in the outbound processing of messages. The message indicates that the system expects an implementing class (ABAP class) to be assigned to a specific filter, but none has been selected or maintained.
  Filters in SAP middleware are used to control or influence message processing, such as filtering messages based on certain criteria or applying custom logic during message processing. Each filter can have an associated implementing class that contains the ABAP code to execute the filter logic.
  If the implementing class is not assigned, the system cannot execute the filter logic, hence the error.
  
  Solution:
  
  
  Identify the Filter Name:
  
  The placeholder &1 in the message will be replaced by the actual filter name when the error occurs. Note down this filter name.
  
  
  Assign an Implementing Class:  
  
  Go to the relevant configuration transaction or customizing node where filters are maintained. This could be in the Integration Engine or middleware configuration.
  Navigate to the filter configuration for outbound processing.
  For the filter mentioned, assign the appropriate implementing ABAP class that contains the filter logic.
  
  
  
  If No Implementing Class Exists:  
  
  Develop a new ABAP class implementing the required interface for filters (usually IF_WES_FILTER or similar).
  Implement the required methods to perform the filtering logic.
  Register this class as the implementing class for the filter.
  
  
  
  Transport and Test:  
  
  After assigning or creating the implementing class, transport the changes to the relevant system.
  Test the outbound processing to ensure the filter logic is executed without errors.
  
  
  
  
  Related Information:
  
  Filter Concept in SAP PI/PO: Filters are used to influence message processing dynamically.
  Implementing Class: Usually an ABAP class implementing a specific interface (e.g., IF_WES_FILTER) that contains the logic for the filter.
  Transaction Codes:  
  
  WE20 (Partner Profiles) — sometimes filters are assigned here for IDoc processing.  
  Customizing paths in SAP NetWeaver for middleware configuration.  
  
  
  SAP Notes and Documentation:  
  
  Check SAP Help Portal for middleware filter configuration.  
  Search for SAP Notes related to WES_OUTBOUND034 for any patches or updates.
  
  
  
  
  If you provide the exact scenario (e.g., IDoc processing, PI/PO integration, etc.), I can give more precise steps.
  
  Summary:
  
  The error WES_OUTBOUND034 means that a filter used in outbound processing does not have an implementing ABAP class assigned. Assign the correct implementing class to the filter or develop one if missing to resolve the issue.