How To Fix W3_TOOL099 - You cannot enter a "next template" for the 'onLoad' event

SAP Error Message - Details

• Message type: E = Error

• Message class: W3_TOOL - ITS: Maintenance Messages

• Message number: 099

• Message text: You cannot enter a "next template" for the 'onLoad' event

Self-Explanatory Message

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• What is the cause and solution for SAP error message W3_TOOL099 - You cannot enter a "next template" for the 'onLoad' event ?

  SAP Error Message:
  W3_TOOL099 You cannot enter a "next template" for the 'onLoad' event.
  
  Cause
  This error occurs in the Web Dynpro ABAP environment when you try to specify a "next template" (i.e., navigate to another view or component) during the onLoad event of a view or component controller. The onLoad event is intended for initialization and setup, and navigation or template switching is not allowed at this stage because the UI is not yet fully initialized.
  In other words, the framework restricts navigation or template changes during the onLoad event to prevent inconsistent UI states or runtime errors.
  
  Explanation
  
  onLoad event: This event is triggered when the view/component is loaded but before it is fully rendered.
  Next template: Refers to the navigation or switching to another view or component template.
  Attempting to set a next template during onLoad violates the lifecycle rules of Web Dynpro UI rendering.
  
  
  Solution
  
  
  Avoid navigation or template switching in the onLoad event.
  Instead, perform navigation