How To Fix PU645 - Could not create or change RFC destination &1

SAP Error Message - Details

• Message type: E = Error

• Message class: PU - Upgrade and Transport Log Messages

• Message number: 645

• Message text: Could not create or change RFC destination &1

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.

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 PU645 - Could not create or change RFC destination &1 ?

  The SAP error message PU645, which states "Could not create or change RFC destination &1," typically occurs when there is an issue with creating or modifying a Remote Function Call (RFC) destination in the SAP system. This can happen for various reasons, and understanding the cause is essential for finding a solution.
  Causes of Error PU645
  
  
  Authorization Issues: The user attempting to create or change the RFC destination may not have the necessary authorizations. This is a common cause of many errors in SAP.
  
  
  Incorrect Parameters: The parameters provided for the RFC destination may be incorrect or incomplete. This includes the target system's details, logon credentials, or connection type.
  
  
  Technical Issues: There may be underlying technical issues, such as network problems, that prevent the system from connecting to the target system.
  
  
  Configuration Errors: The SAP system may not be properly configured to allow the creation or modification of RFC destinations.
  
  
  System Lock: The system might be in a state where it is locked for changes, possibly due to a transport request or other administrative tasks.
  
  
  Solutions to Error PU645
  
  
  Check Authorizations: Ensure that the user has the necessary authorizations to create or change RFC destinations. This can be done by checking the user's roles and authorizations in transaction SU53 or SUIM.
  
  
  Verify Parameters: Double-check the parameters being used to create or change the RFC destination. Ensure that all required fields are filled out correctly, including the target host, system number, client, user, and password.
  
  
  Network Connectivity: Test the network connection to the target system. You can use tools like ping or telnet to check if the target system is reachable.
  
  
  Review Configuration: Check the configuration settings in transaction SM59 (RFC Destinations). Ensure that the destination is set up correctly and that the connection type is appropriate for your needs.
  
  
  Check for Locks: Investigate if there are any locks on the system that might prevent changes. You can check transaction SM12 for any locks that might be affecting the RFC destination.
  
  
  Consult Logs: Review the system logs (transaction SM21) for any additional error messages or warnings that might provide more context about the issue.
  
  
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that might address this specific error or provide additional troubleshooting steps.
  
  
  Related Information
  
  
  Transaction Codes: 
  
  SM59: To manage RFC destinations.
  SU53: To check authorization issues.
  SM21: To view system logs.
  SM12: To check for locks.
  
  
  
  Documentation: Refer to the official SAP documentation for detailed information on RFC destinations and their configuration.
  
  
  SAP Community: Engage with the SAP Community forums for insights from other users who may have encountered similar issues.
  
  
  By following these steps, you should be able to identify the cause of the PU645 error and implement a solution to resolve it.