How To Fix WD451 - Rule '&' does not exist

WD451 - Overview

• Message type: E = Error

• Message class: WD - Workflow definition

• Message number: 451

• Message text: Rule '&' does not exist

Self-Explanatory Message

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• What is the cause and solution for SAP error message WD451 - Rule '&' does not exist ?

  SAP Error Message:
  WD451 Rule '&' does not exist
  
  
  Cause:
  This error occurs in the Web Dynpro ABAP environment when the system tries to access a navigation rule or a navigation link identified by the name '&', but such a rule does not exist in the component or application.
  The root cause is typically one of the following:
  
  A navigation rule or outbound plug is referenced with the name '&' (ampersand) either by mistake or due to incorrect coding/configuration.
  The navigation link or rule name is dynamically determined, and the variable or expression evaluating to '&' instead of a valid rule name.
  A typo or copy-paste error in the navigation configuration or in the code that triggers navigation.
  Sometimes, this can happen if the navigation rule name is not properly passed or is empty, and the system interprets it as '&'.
  
  
  Explanation:
  In Web Dynpro ABAP, navigation between views/components is controlled by navigation rules (also called outbound plugs). Each outbound