How To Fix W8137 - Constants cannot be declared here

W8137 - Overview

• Message type: E = Error

• Message class: W8 - Workflow: Expressions, data flow

• Message number: 137

• Message text: Constants cannot be declared here

What causes this issue?

You tried to specify a constant for an expression. This is not possible
in this situation since the destination of the binding must be a
variable, that is a container element.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Either enter a variable expression in the form &Elementname& or define
an expression using the input help.

Error message extract from SAP system. Copyright SAP SE.

W8137 - Details

• SAP Error Message:
  W8137 - Constants cannot be declared here
  
  
  Cause:
  This warning occurs when you try to declare a constant in a part of the ABAP program where constant declarations are not allowed. In ABAP, constants must be declared in specific sections such as the TOP INCLUDE, DATA DECLARATION part of a program, or within a CLASS or INTERFACE definition, but not inside executable code blocks like FORM routines, METHODS, or inside procedural code blocks.
  For example, declaring a constant inside a FORM or METHOD implementation or inside a procedural block will trigger this warning.
  
  Explanation:
  
  Constants are static values that do not change during program execution.
  They must be declared in the global or local declaration part of the program or class.
  Declaring constants inside procedural code is syntactically incorrect.
  
  
  
  Solution:
  
  Move the constant declaration to an appropriate place:
  For report programs or function modules, declare constants in the TOP INCLUDE or the global declaration section.
  For class-based programs, declare