How To Fix E0555 - RFC destination '&' not known

SAP Error Message - Details

• Message type: E = Error

• Message class: E0 - SAP EDI messages

• Message number: 555

• Message text: RFC destination '&' not known

What causes this issue?

The RFC destination stated is not yet maintained in the system.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Please maintain the RFC destination first.

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ENDIF

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message E0555 - RFC destination '&' not known ?

  The SAP error message E0555, which states "RFC destination '&' not known," typically occurs when the system is unable to find a specified Remote Function Call (RFC) destination. This can happen for various reasons, and here are some common causes, solutions, and related information:
  Causes:
  
  Incorrect RFC Destination Name: The name of the RFC destination specified in the program or configuration may be incorrect or misspelled.
  RFC Destination Not Created: The RFC destination has not been created in the SAP system.
  Transport Issues: The RFC destination may exist in one system (e.g., development) but not in another (e.g., production).
  Authorization Issues: The user may not have the necessary authorizations to access the specified RFC destination.
  Network Issues: There may be network connectivity issues preventing access to the target system.
  Configuration Issues: The configuration of the RFC destination may be incorrect or incomplete.
  
  Solutions:
  
  
  Check RFC Destination Name:
  
  Verify that the name of the RFC destination is correct. Check for any typos or incorrect characters.
  
  
  
  Create or Maintain RFC Destination:
  
  Go to transaction code SM59 in the SAP GUI.
  Check if the RFC destination exists. If it does not, create a new one by clicking on "Create" and filling in the necessary details.
  If it exists, ensure that it is configured correctly (e.g., connection type, target host, system number).
  
  
  
  Transport the RFC Destination:
  
  If the RFC destination is missing in the target system, transport it from the source system where it is defined.
  
  
  
  Check Authorizations:
  
  Ensure that the user has the necessary authorizations to access the RFC destination. This can be checked in transaction SU53 after the error occurs.
  
  
  
  Test Connection:
  
  In transaction SM59, select the RFC destination and use the "Connection Test" option to verify that the connection to the target system is working.
  
  
  
  Check Network Configuration:
  
  Ensure that there are no network issues preventing the connection to the target system. This may involve checking firewalls, VPNs, or other network configurations.
  
  
  
  Review Logs:
  
  Check the system logs (transaction SM21) for any additional error messages or information that may provide more context about the issue.
  
  
  
  Related Information:
  
  RFC Destinations: RFC destinations are used in SAP to define the connection parameters for remote systems. They can be of different types, such as T (TCP/IP), G (HTTP), or H (HTTP with SSL).
  Transaction Codes:
  
  SM59: Manage RFC destinations.
  SU53: Analyze authorization issues.
  SM21: View system logs.
  
  
  Documentation: Refer to SAP Help documentation for detailed information on configuring and troubleshooting RFC destinations.
  
  By following these steps, you should be able to identify and resolve the issue related to the RFC destination not being known in your SAP system.