How To Fix WG406 - Error calling user exit &1 in FM: &2

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 406

• Message text: Error calling user exit &1 in FM: &2

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WG406 - Error calling user exit &1 in FM: &2 ?

  Certainly! Here's a detailed explanation of the SAP error message:
  
  SAP Error Message:
  WG406 - Error calling user exit &1 in FM: &2
  
  Meaning / Cause:
  
  This error occurs when the system tries to call a user exit function module (FM) during processing (often in the context of SAP Workflow or other enhancement points), but the call fails.
  The placeholders &1 and &2 represent:
  
  &1: The name of the user exit (function module) that was called.
  &2: The actual function module name where the error occurred.
  
  
  The cause can be:
  
  The user exit FM does not exist or is not active.
  The FM has a runtime error or exception.
  Incorrect parameters passed to the FM.
  Authorization or system issues preventing the FM from executing.
  The FM is not properly implemented or registered in the system.
  
  
  
  
  Where does it occur?
  
  Typically during workflow processing or when SAP calls user exits/enhancements in standard function modules.
  Common in scenarios where custom logic is added via user exits or BAdIs.
  
  
  Solution / Troubleshooting Steps:
  
  
  Check the User Exit FM:
  
  Verify that the function module named in &1 exists in the system (use transaction SE37).
  Check if the FM is active and properly implemented.
  
  
  
  Debug the FM:
  
  Use debugging (SE37 or workflow debugger) to trace the error inside the FM.
  Look for runtime errors, exceptions, or incorrect logic.
  
  
  
  Check Parameters:
  
  Ensure that the parameters passed to the FM are correct and consistent with the FM interface.
  
  
  
  Check for Authorization Issues:
  
  Verify if the user executing the FM has the necessary authorizations.
  
  
  
  Check System Logs:
  
  Look into system logs (SM21), short dumps (ST22), or workflow logs (SWI1) for more detailed error information.
  
  
  
  Review Implementation:
  
  If the FM is a user exit, check if the exit is properly implemented and registered.
  If it is a BAdI or enhancement, verify the implementation.
  
  
  
  Transport and System Consistency:
  
  Ensure that the FM and related objects are correctly transported and consistent across systems.
  
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SE37: Function Module maintenance and testing.
  SWI1: Workflow log.
  ST22: ABAP runtime errors.
  SM21: System log.
  SE80: Object Navigator (to check enhancements/user exits).
  
  
  
  User Exits and Enhancements:
  
  User exits are customer-specific enhancements to standard SAP functionality.
  They are often implemented as function modules or include programs.
  Proper implementation and testing are crucial.
  
  
  
  SAP Notes:
  
  Check SAP Notes for any known issues related to the specific user exit or FM.
  
  
  
  
  Summary:
  
  
  
  Aspect
  Details
  
  
  
  
  Error
  WG406 - Error calling user exit FM
  
  
  Cause
  FM missing, inactive, runtime error, or incorrect parameters
  
  
  Solution
  Verify FM existence, debug FM, check parameters and authorizations
  
  
  Tools
  SE37, SWI1, ST22, SM21, SE80
  
  
  Context
  Workflow or enhancement user exit call
  
  
  
  
  If you provide the actual FM names (&1 and &2), I can help you with more specific guidance.