How To Fix SWL020 - Event arrived in customer-specific function module

SAP Error Message - Details

• Message type: E = Error

• Message class: SWL - WF: New User Interface Messages in Workflow (Client)

• Message number: 020

• Message text: Event arrived in customer-specific function module

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SWL020 - Event arrived in customer-specific function module ?

  The SAP error message SWL020, which states "Event arrived in customer-specific function module," typically occurs in the context of SAP Workflow. This message indicates that an event was triggered, but the system encountered an issue while processing it in a customer-specific function module.
  Cause:
  
  Custom Code Issues: The most common cause of this error is a problem in the custom function module that has been implemented to handle the event. This could be due to syntax errors, logical errors, or unhandled exceptions in the code.
  Event Configuration: The event may not be properly configured in the workflow or the event linkage may not be correctly set up.
  Missing Data: The function module may be expecting certain data or parameters that are not being provided when the event is triggered.
  Authorization Issues: The user or process triggering the event may not have the necessary authorizations to execute the function module.
  
  Solution:
  
  
  Debugging the Function Module: 
  
  Use transaction SE37 to access the function module and debug it. Check for any runtime errors or exceptions that may be occurring.
  Ensure that the function module is correctly handling all expected input parameters and that it is returning the expected output.
  
  
  
  Check Event Configuration:
  
  Verify that the event is correctly defined in the workflow and that it is linked to the appropriate function module.
  Use transaction SWDD to check the workflow definition and ensure that the event is correctly configured.
  
  
  
  Review Custom Code:
  
  If the function module contains custom code, review it for any potential issues. Look for unhandled exceptions or logic that may not be functioning as intended.
  Ensure that the code adheres to best practices and is optimized for performance.
  
  
  
  Authorization Checks:
  
  Ensure that the user or process triggering the event has the necessary authorizations to execute the function module. Check the authorization objects related to the workflow and function module.
  
  
  
  Testing:
  
  After making changes, test the workflow to ensure that the event is processed correctly without triggering the error.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SWDD: Workflow Builder - to check and modify workflows.
  SWI1: Work Item Selection - to monitor work items and events.
  SE37: Function Module - to view and debug function modules.
  
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to the specific function module or workflow you are working with.
  
  
  Documentation: Review SAP documentation on workflows and event handling for best practices and guidelines.
  
  
  If the issue persists after following these steps, consider reaching out to SAP support or consulting with a developer who has experience with SAP workflows and custom function modules.