How To Fix WD405 - Container element '&' is an object

WD405 - Overview

• Message type: E = Error

• Message class: WD - Workflow definition

• Message number: 405

• Message text: Container element '&' is an object

Self-Explanatory Message

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• What is the cause and solution for SAP error message WD405 - Container element '&' is an object ?

  SAP Error Message:
  WD405 Container element '&' is an object
  
  Cause
  This error occurs in Web Dynpro when you try to access a container element (attribute or node) in the component controller or context that is actually an object reference, but you are treating it as a simple data element (e.g., trying to read or write it as a value instead of handling it as an object).
  In other words, the container element you are trying to access is an object reference (an instance of a class), but your code or the Web Dynpro framework expects a simple data element (like a string, integer, or structure). This mismatch causes the error.
  
  Explanation
  
  In Web Dynpro, context nodes can have attributes of simple types (string, integer, etc.) or complex types (structures, objects).
  If a context attribute is defined as an object reference (e.g., a reference to a class instance), you cannot access it directly as a simple value.
  The