How To Fix WG042 - Unknown dispatcher call

SAP Error Message - Details

• Message type: E = Error

• Message class: WG - Messages for store order and investment buy

• Message number: 042

• Message text: Unknown dispatcher call

What causes this issue?

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

System Response

How to fix this error?

INCLUDE ISR_SYSTEMFEHLER

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message WG042 - Unknown dispatcher call ?

  SAP Error Message:
  
  WG042 - Unknown dispatcher call
  
  Cause:
  The error message WG042 - Unknown dispatcher call typically occurs when the SAP system receives a dispatcher call (a request to execute a function module or a remote function call) that it does not recognize or cannot process. This can happen due to:
  
  A mismatch or inconsistency in the function module name or interface.
  The function module being called does not exist or is not registered properly.
  Issues with the Remote Function Call (RFC) destination or communication.
  Corrupted or outdated function module metadata.
  Problems in the dispatcher or gateway communication layer.
  Calling a function module that is not released for remote calls or is restricted.
  
  
  Solution:
  To resolve the WG042 - Unknown dispatcher call error, consider the following steps:
  
  
  Check the Function Module Name:
  
  Verify that the function module name being called is correct and exists in the system.
  Ensure the function module is released for remote calls (check the "Remote-Enabled Module" flag in SE37).
  
  
  
  Check RFC Destinations:
  
  If the call is via RFC, verify the RFC destination configuration (transaction SM59).
  Test the RFC connection to ensure it is working properly.
  
  
  
  Check Authorization:
  
  Ensure the user executing the call has the necessary authorizations.
  
  
  
  Check for System or Kernel Issues:
  
  Sometimes, kernel or dispatcher inconsistencies cause this error.
  Restart the dispatcher or the SAP instance if necessary.
  Check for OSS notes related to dispatcher or kernel issues.
  
  
  
  Check for Transport or Version Mismatches:
  
  If the function module was recently changed or transported, ensure all systems are in sync.
  Re-import or re-activate the function module if needed.
  
  
  
  Check Gateway and Dispatcher Logs:
  
  Review system logs (SM21), developer traces (ST11), and gateway logs for more detailed error information.
  
  
  
  SAP Notes and Support:
  
  Search for relevant SAP Notes using the error message or symptoms.
  If the problem persists, consider raising a support ticket with SAP.
  
  
  
  
  Related Information:
  
  Transaction SE37: Function Builder to check and test function modules.
  Transaction SM59: RFC Destinations configuration and testing.
  Transaction SM21: System log for error analysis.
  Transaction ST11: Developer traces for detailed error logs.
  SAP Gateway: Responsible for communication between SAP systems and external programs.
  SAP Kernel: The dispatcher is part of the kernel; kernel patches or updates may be required.
  
  
  Summary:
  WG042 - Unknown dispatcher call means the SAP dispatcher received a call it cannot identify or process, often due to incorrect function module calls, RFC issues, or system inconsistencies. Verify the function module, RFC setup, authorizations, and system logs to diagnose and fix the issue. Restarting the dispatcher or applying relevant SAP Notes may also be necessary.