How To Fix EDESK_COMM_PIO018 - Message class &1 is not allowed as return message; message was ignored

SAP Error Message - Details

• Message type: E = Error

• Message class: EDESK_COMM_PIO - Engineering Desktop: Partner Integration Outbound

• Message number: 018

• Message text: Message class &1 is not allowed as return message; message was ignored

Self-Explanatory Message

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To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message EDESK_COMM_PIO018 - Message class &1 is not allowed as return message; message was ignored ?

  The SAP error message EDESK_COMM_PIO018 indicates that a message class is not allowed to be used as a return message in the context of the communication process. This typically occurs in scenarios involving the Electronic Data Interchange (EDI) or Application Interface Framework (AIF) where specific message classes are expected to follow certain rules.
  Cause:
  
  Invalid Message Class: The message class specified in the communication process is not configured to be used as a return message. This could be due to incorrect configuration or an attempt to use a message class that is not intended for this purpose.
  Configuration Issues: The system may not have the necessary configuration to handle the specified message class as a return message.
  Custom Development: If there are custom developments or modifications in the system, they might not adhere to the expected message class rules.
  
  Solution:
  
  
  Check Message Class Configuration:
  
  Verify the configuration of the message class in the relevant transaction (e.g., WE20 for partner profiles, WE21 for port definitions).
  Ensure that the message class you are trying to use is allowed for return messages.
  
  
  
  Review Documentation:
  
  Consult the SAP documentation or help files related to the specific message class to understand its intended use and restrictions.
  
  
  
  Adjust Custom Code:
  
  If there is custom code involved, review it to ensure that it is correctly handling message classes and not attempting to use an invalid one as a return message.
  
  
  
  Consult SAP Notes:
  
  Check for any relevant SAP Notes that might address this specific error message or provide guidance on configuration.
  
  
  
  Testing:
  
  After making any changes, conduct thorough testing to ensure that the issue is resolved and that the system behaves as expected.
  
  
  
  Related Information:
  
  Message Classes: In SAP, message classes are used to categorize messages for various applications. Each message class has specific rules regarding its usage.
  EDI/AIF: If you are working with EDI or AIF, ensure that you are familiar with the specific configurations and message types that are supported.
  SAP Community: Engaging with the SAP Community or forums can provide insights from other users who may have encountered similar issues.
  
  If the problem persists after following these steps, it may be beneficial to reach out to SAP support for further assistance.