How To Fix /SAPAPO/ND420 - * Messages of optimizer: RFC error *********************************

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/ND -

• Message number: 420

• Message text: * Messages of optimizer: RFC error *********************************

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPAPO/ND420 - * Messages of optimizer: RFC error ********************************* ?

  The SAP error message /SAPAPO/ND420 indicates an RFC (Remote Function Call) error that occurs during the execution of the optimizer in SAP Advanced Planning and Optimization (APO). This error typically arises when there is a communication issue between the SAP APO system and the backend system (such as SAP ERP) or when there are problems with the configuration of the RFC connections.
  Causes:
  
  Network Issues: There may be network connectivity problems between the APO system and the backend system.
  RFC Destination Configuration: The RFC destination used by the optimizer may not be correctly configured or may be inactive.
  Authorization Issues: The user credentials used for the RFC connection may not have the necessary authorizations to execute the optimizer.
  System Performance: The backend system may be experiencing performance issues, leading to timeouts or failures in processing the RFC calls.
  System Configuration: There may be inconsistencies in the configuration of the APO system or the backend system.
  
  Solutions:
  
  
  Check RFC Destination:
  
  Go to transaction SM59 in the SAP GUI and verify the configuration of the RFC destination used by the optimizer.
  Test the connection to ensure it is working properly.
  
  
  
  Network Connectivity:
  
  Ensure that there are no network issues between the APO and backend systems. You can use tools like ping or traceroute to check connectivity.
  
  
  
  User Authorizations:
  
  Verify that the user used for the RFC connection has the necessary authorizations to execute the optimizer functions.
  
  
  
  System Performance:
  
  Check the performance of the backend system. Look for any long-running processes or locks that may be affecting the optimizer's ability to communicate.
  
  
  
  Review Logs:
  
  Check the system logs (transaction SM21) and the application logs (transaction SLG1) for any additional error messages that may provide more context about the issue.
  
  
  
  Restart Services:
  
  If the issue persists, consider restarting the relevant services or instances in both the APO and backend systems.
  
  
  
  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:
  
  Transaction Codes: 
  
  SM59 (RFC Destinations)
  SM21 (System Log)
  SLG1 (Application Log)
  
  
  SAP Documentation: Refer to the official SAP documentation for APO and RFC configuration for detailed guidance.
  SAP Community: Engage with the SAP Community forums for insights from other users who may have encountered similar issues.
  
  If the problem persists after trying the above solutions, it may be necessary to involve your SAP Basis team or SAP support for further investigation.