How To Fix /IWFND/CM_MGW002 - The RFC call was not successful for unknown reasons

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWFND/CM_MGW -

• Message number: 002

• Message text: The RFC call was not successful for unknown reasons

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /IWFND/CM_MGW002 - The RFC call was not successful for unknown reasons ?

  The SAP error message /IWFND/CM_MGW002 The RFC call was not successful for unknown reasons typically occurs in the context of SAP Gateway and OData services when there is an issue with the Remote Function Call (RFC) to the backend system. This error can arise from various underlying causes, and troubleshooting it may require a systematic approach. Here are some common causes, potential solutions, and related information:
  Common Causes
  
  
  Network Issues: There may be network connectivity problems between the SAP Gateway and the backend system.
  
  
  Authorization Issues: The user executing the OData service may not have the necessary authorizations to perform the requested operation.
  
  
  Backend System Errors: The backend system may be down, or there may be issues with the specific function module being called.
  
  
  Configuration Issues: Incorrect configuration of the RFC destination in the SAP Gateway system can lead to this error.
  
  
  Timeouts: The RFC call may be timing out due to long processing times in the backend.
  
  
  Data Issues: Invalid or unexpected data being sent in the request can cause the backend to fail.
  
  
  Solutions
  
  
  Check Network Connectivity:
  
  Ensure that the SAP Gateway can reach the backend system. You can use tools like ping or telnet to check connectivity.
  
  
  
  Review Authorization:
  
  Verify that the user has the necessary authorizations to execute the OData service. Check roles and authorizations in the backend system.
  
  
  
  Check Backend System Status:
  
  Ensure that the backend system is up and running. Check for any system logs or errors in the backend that might indicate issues.
  
  
  
  Validate RFC Destination:
  
  Go to transaction SM59 in the SAP Gateway system and check the configuration of the RFC destination. Test the connection to ensure it is working correctly.
  
  
  
  Increase Timeout Settings:
  
  If timeouts are suspected, consider increasing the timeout settings for the RFC call in the SAP Gateway configuration.
  
  
  
  Debugging:
  
  Use transaction SLG1 to check for application logs related to the OData service. This can provide more context on what went wrong.
  You can also use transaction SE37 to test the specific function module being called to see if it works independently.
  
  
  
  Check Data:
  
  Review the data being sent in the request to ensure it is valid and meets the expected format.
  
  
  
  Related Information
  
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide patches and updates.
  Transaction Codes:
  
  SM59: RFC Destinations
  SLG1: Application Log
  SE37: Function Module
  ST22: Dump Analysis (to check for ABAP runtime errors)
  
  
  SAP Gateway Logs: Use transaction /IWFND/ERROR_LOG to view error logs related to OData services.
  
  By systematically checking these areas, you should be able to identify the root cause of the error and implement an appropriate solution. If the issue persists, consider reaching out to SAP support for further assistance.