How To Fix CX_MSR_LFE002 - RFC error while waiting for callback; no asynchronous function calls

SAP Error Message - Details

• Message type: E = Error

• Message class: CX_MSR_LFE - Messages in logistical follow-up execution

• Message number: 002

• Message text: RFC error while waiting for callback; no asynchronous function calls

What causes this issue?

An asynchronous remote function call (RFC) with callback routines has
been executed. Program execution was interrupted until a callback
routine of the previous function &V1& that was called asynchronously was
executed.
However, no asynchronous function calls were found.

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?

Check whether creation of follow-up documents is still running in the
background.
Logisitcal follow-up execution (LFE) for <DS:DE.MSR_PROCESS_ID>MSR_ID</>
&V2& has to run again.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CX_MSR_LFE002 - RFC error while waiting for callback; no asynchronous function calls ?

  The SAP error message CX_MSR_LFE002 indicates an RFC (Remote Function Call) error that occurs when the system is waiting for a callback but does not receive any asynchronous function calls. This error typically arises in scenarios involving asynchronous processing, such as when using background jobs, workflows, or when integrating with external systems.
  Causes:
  
  Network Issues: There may be network connectivity problems between the SAP system and the external system or between different SAP systems.
  Timeouts: The callback may not be received within the expected time frame, leading to a timeout.
  Configuration Issues: Incorrect configuration of the RFC destination or the asynchronous function module can lead to this error.
  System Load: High system load or performance issues may delay the processing of asynchronous calls.
  Missing or Incorrect Implementation: The asynchronous function module may not be implemented correctly or may be missing entirely.
  
  Solutions:
  
  Check Network Connectivity: Ensure that there are no network issues between the systems involved. You can use tools like ping or traceroute to diagnose connectivity problems.
  Review RFC Configuration: Verify the configuration of the RFC destination in transaction SM59. Ensure that the destination is correctly set up and that the connection is working.
  Increase Timeout Settings: If timeouts are an issue, consider increasing the timeout settings for the RFC calls. This can be done in the RFC destination settings.
  Monitor System Performance: Check the performance of the SAP system and the external systems. Use transaction SM50 or SM66 to monitor active processes and identify any bottlenecks.
  Check Logs: Review the application logs (transaction SLG1) and system logs (transaction SM21) for any related error messages that could provide more context.
  Debugging: If you have access to the ABAP code, consider debugging the asynchronous function module to ensure it is being called and processed correctly.
  Consult Documentation: Review SAP documentation or notes related to the specific function module or process you are working with for any known issues or additional configuration steps.
  
  Related Information:
  
  Asynchronous RFC (aRFC): Understand how aRFC works in SAP, as this error is related to asynchronous processing.
  SAP Notes: Check SAP Notes for any known issues or patches related to the specific version of SAP you are using.
  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 beneficial to contact SAP support for further assistance.