How To Fix MK018 - &1 (RFC error) - return value was &2

SAP Error Message - Details

• Message type: E = Error

• Message class: MK - Mass Handling in the Material Master

• Message number: 018

• Message text: &1 (RFC error) - return value was &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.

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.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message MK018 - &1 (RFC error) - return value was &2 ?

  The SAP error message MK018 indicates an RFC (Remote Function Call) error, which typically occurs when there is a problem with communication between SAP systems or between an SAP system and an external system. The message format is as follows:
  
  MK018 &1 (RFC error) - return value was &2
  
  Where &1 represents the specific RFC function or destination that encountered the error, and &2 indicates the return value or error code that was received.
  Causes of MK018 Error
  
  
  Network Issues: There may be network connectivity problems between the SAP systems or between the SAP system and the external system.
  
  
  RFC Destination Configuration: The RFC destination may not be configured correctly. This includes incorrect settings for the target system, such as the system ID, client number, user credentials, or connection type.
  
  
  Authorization Issues: The user credentials used for the RFC connection may not have the necessary authorizations to execute the requested function.
  
  
  Function Module Issues: The function module being called may not exist in the target system, or it may have been changed or deactivated.
  
  
  System Load or Performance Issues: High load on the target system may lead to timeouts or other performance-related errors.
  
  
  Version Compatibility: There may be compatibility issues between different versions of SAP systems.
  
  
  Solutions to MK018 Error
  
  
  Check Network Connectivity: Ensure that there are no network issues preventing communication between the systems. You can use tools like ping or traceroute to diagnose network problems.
  
  
  Verify RFC Destination: Go to transaction SM59 in the SAP GUI and check the configuration of the RFC destination. Ensure that all parameters are correctly set, including the target system's details.
  
  
  Test RFC Connection: In transaction SM59, you can test the RFC connection to see if it is working correctly. This will help identify if the issue is with the connection itself.
  
  
  Check Authorizations: Ensure that the user credentials used for the RFC connection have the necessary authorizations to execute the function module.
  
  
  Review Function Module: Check if the function module being called exists in the target system and is active. You can do this by using transaction SE37 or SE80.
  
  
  Monitor System Performance: Check the performance of the target system to ensure it is not overloaded. You can use transaction SM50 or SM66 to monitor active processes.
  
  
  Consult SAP Notes: Look for relevant SAP Notes in the SAP Support Portal that may address known issues related to the MK018 error.
  
  
  Check Logs: Review the system logs (transaction SM21) and the application logs (transaction SLG1) for any additional error messages that may provide more context about the issue.
  
  
  Related Information
  
  
  Transaction Codes: 
  
  SM59: RFC Destinations
  SM21: System Log
  SLG1: Application Log
  SE37: Function Module
  SM50/SM66: Process Overview
  
  
  
  SAP Notes: Always check the SAP Support Portal for any specific notes related to the MK018 error, as they may provide additional troubleshooting steps or patches.
  
  
  By following these steps, you should be able to diagnose and resolve the MK018 RFC error in your SAP environment.