How To Fix WD421 - Event '&' not maintained

SAP Error Message - Details

• Message type: E = Error

• Message class: WD - Workflow definition

• Message number: 421

• Message text: Event '&' not maintained

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WD421 - Event '&' not maintained ?

  The SAP error message:
  WD421 Event '&' not maintained
  typically occurs in the context of Web Dynpro applications.
  
  Cause
  This error means that an event (whose name is represented by the placeholder '&') is being triggered or called in a Web Dynpro component, but this event has not been defined or maintained in the component's interface or controller. In other words, the Web Dynpro application is trying to handle an event that does not exist or has not been properly declared.
  Common scenarios include:
  
  The event is referenced in the code (e.g., in the view controller or component controller) but was never created or maintained in the event tab.
  The event name is misspelled or incorrect.
  The event is expected to be raised by a UI element (like a button or action) but the event handler is missing.
  The component interface does not include the event, but the code tries to raise or handle it.
  
  
  Solution
  
  
  Check the Event Definition:
  
  Open the Web Dynpro component in the SAP Web Dynpro Explorer.
  Navigate to the controller (component controller, view controller, or window controller) where the event is supposed to be defined.
  Go to the Events tab and verify if the event with the given name exists.
  If it does not exist, create the event with the exact name.
  
  
  
  Check Event Usage:
  
  Verify where the event is being raised or handled in the code.
  Make sure the event name matches exactly with the event defined in the controller.
  Correct any spelling mistakes or mismatches.
  
  
  
  Maintain Event in Component Interface (if applicable):
  
  If the event is part of the component interface (used for communication between components), ensure it is declared in the component interface.
  Maintain the event in the interface controller's event tab.
  
  
  
  Regenerate and Activate:
  
  After maintaining the event, regenerate and activate the Web Dynpro component.
  Test the application again.
  
  
  
  
  Related Information
  
  SAP Note: Sometimes, SAP Notes related to Web Dynpro event handling might provide additional fixes or patches.
  Web Dynpro Documentation: SAP Help Portal for Web Dynpro ABAP provides detailed information on event handling.
  Transaction: Use SE80 or the Web Dynpro Explorer to maintain components.
  Debugging: Use the debugger to check where the event is being raised and verify the event name.
  
  
  Summary
  
  
  
  Aspect
  Details
  
  
  
  
  Error
  WD421 Event '&' not maintained
  
  
  Cause
  Event referenced in code but not defined in controller or component interface
  
  
  Solution
  Define/maintain the event in the controller or component interface; check spelling; activate component
  
  
  Tools
  SE80, Web Dynpro Explorer, Debugger
  
  
  
  
  If you provide the exact event name or context, I can help you with more specific instructions.