How To Fix APO_BAPI136 - Unknown error when calling up RFC function &1 with destination &2

SAP Error Message - Details

• Message type: E = Error

• Message class: APO_BAPI - Message Class for APO BAPIs

• Message number: 136

• Message text: Unknown error when calling up RFC function &1 with destination &2

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

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Smart SAP Assistant

• What is the cause and solution for SAP error message APO_BAPI136 - Unknown error when calling up RFC function &1 with destination &2 ?

  The SAP error message APO_BAPI136 indicates that there is an unknown error occurring when trying to call a Remote Function Call (RFC) function with a specified destination. This error can arise in various scenarios, particularly in the context of SAP Advanced Planning and Optimization (APO) or when integrating with other SAP systems.
  Possible Causes:
  
  Network Issues: There may be network connectivity problems between the systems involved in the RFC call.
  Destination Configuration: The RFC destination may not be correctly configured in the SAP system. This includes issues with the connection parameters, such as the target system's IP address, port, or logon credentials.
  Authorization Issues: The user executing the RFC call may not have the necessary authorizations to access the target function module.
  Function Module Issues: The function module being called may not exist, may be inactive, or may have been changed or deleted.
  System Performance: The target system may be experiencing performance issues, leading to timeouts or other errors.
  Version Compatibility: There may be compatibility issues between the calling and target systems, especially if they are running different versions of SAP.
  
  Solutions:
  
  
  Check RFC Destination:
  
  Go to transaction SM59 and verify the configuration of the RFC destination. Ensure that the connection parameters are correct and that the destination is reachable.
  Test the connection from SM59 to ensure it is working properly.
  
  
  
  Review Authorizations:
  
  Ensure that the user executing the RFC call has the necessary authorizations to access the function module in the target system.
  
  
  
  Check Function Module:
  
  Verify that the function module being called exists in the target system and is active. You can check this using transaction SE37 or SE80.
  
  
  
  Network Troubleshooting:
  
  Check for any network issues that may be affecting connectivity between the systems. This may involve checking firewalls, network routes, or other network configurations.
  
  
  
  Monitor System Performance:
  
  Use transaction SM50 or SM66 to monitor the performance of the target system. Look for any long-running processes or performance bottlenecks.
  
  
  
  Check Logs:
  
  Review the system logs (transaction SM21) and the application logs (transaction SLG1) for any additional error messages or warnings that may provide more context about the issue.
  
  
  
  Consult SAP Notes:
  
  Search for relevant SAP Notes in the SAP Support Portal that may address this specific error message or provide additional troubleshooting steps.
  
  
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for more details on RFC and BAPIs.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  SAP Support: If the issue persists and cannot be resolved through the above steps, consider reaching out to SAP Support for further assistance.
  
  By following these steps, you should be able to diagnose and resolve the APO_BAPI136 error effectively.