How To Fix WD400 - Function '&' not active/implemented

WD400 - Overview

• Message type: E = Error

• Message class: WD - Workflow definition

• Message number: 400

• Message text: Function '&' not active/implemented

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message WD400 - Function '&' not active/implemented ?

  The SAP error message:
  WD400 Function '&' not active/implemented
  typically occurs in the context of Web Dynpro ABAP applications.
  
  Cause
  This error indicates that a particular Web Dynpro function (method or action) referenced by the placeholder & is either:
  
  Not activated, or
  Not implemented in the Web Dynpro component or controller.
  
  The & symbol in the message is a placeholder for the actual function name that is missing or inactive.
  Common scenarios include:
  
  Calling an action or method in the Web Dynpro component that has not been implemented.
  The function is defined but not activated in the Web Dynpro component.
  The Web Dynpro application is trying to invoke a function that does not exist in the current context.
  
  
  Solution
  
  
  Identify the function name:
  
  Check the actual error message in the system logs or trace to find the exact function name instead of &.
  If the message shows &, it might be a generic message or the function name is missing due to some issue.
  
  
  
  Check the