How To Fix WD406 - Line for event '&' was reassigned

WD406 - Overview

• Message type: E = Error

• Message class: WD - Workflow definition

• Message number: 406

• Message text: Line for event '&' was reassigned

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WD406 - Line for event '&' was reassigned ?

  The SAP error message:
  WD406 Line for event '&' was reassigned
  typically occurs in the context of Web Dynpro applications.
  
  Cause
  This error indicates that an event handler for a particular event has been assigned more than once to the same UI element or controller. In other words, the event line (connection) has been reassigned or duplicated, which is not allowed.
  This usually happens when:
  
  The same event handler method is assigned multiple times to the same event.
  There is a programming or configuration mistake where event handlers are attached repeatedly.
  The component or view lifecycle causes event handlers to be attached multiple times (e.g., in WDDOINIT or other lifecycle methods without proper checks).
  
  
  Explanation
  In Web Dynpro, events are linked to handler methods via event lines. Each event can only have one handler assigned per UI element or controller. If the system detects that an event line is being reassigned (i.e., the event handler is being set again for