How To Fix WER168 - Expression assignment is not supported for this parameter

WER168 - Overview

• Message type: E = Error

• Message class: WER - Messages for the package WER

• Message number: 168

• Message text: Expression assignment is not supported for this parameter

Self-Explanatory Message

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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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message WER168 - Expression assignment is not supported for this parameter ?

  The SAP error message WER168: "Expression assignment is not supported for this parameter" typically occurs in the context of ABAP Web Dynpro or Web Dynpro for ABAP development, particularly when dealing with context node attributes or component controller parameters.
  
  Cause
  
  Expression assignment is attempted on a parameter or attribute that does not support it.
  
  In Web Dynpro, parameters or context attributes can be assigned values either by direct assignment or by expression assignment (using binding expressions). However, not all parameters or attributes support expression assignment.
  For example, if you try to assign a value to a parameter or context attribute using an expression (like a binding expression or a formula) where only direct assignment is allowed, the system raises this error.
  Common scenarios include:
  
  Trying to assign an expression to an importing parameter of a component controller or a view controller.
  Assigning an expression to a parameter that is not designed to accept expressions (e.g., parameters that