How To Fix W8186 - Expression & is not a constant

W8186 - Overview

• Message type: E = Error

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

• Message number: 186

• Message text: Expression & is not a constant

What causes this issue?

A constant must be entered in the current function.
In the case of expression &V1&, however, according to SAP Business
Workflow syntax, we are dealing with a variable.

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?

Please enter a constant.

Error message extract from SAP system. Copyright SAP SE.

W8186 - Details

• SAP Error Message:
  W8186: Expression & is not a constant
  
  
  Cause:
  This warning message occurs in ABAP when an expression that is expected to be a constant is not a constant. Typically, this happens in contexts where the ABAP compiler requires a literal or a constant expression, but a variable or a non-constant expression is provided instead.
  For example, this can happen in:
  
  DATA declarations with VALUE or CONSTANTS statements where the value assigned must be a constant.
  SELECT-OPTIONS or PARAMETERS default values that require constants.
  When using expressions in places where only constants are allowed, such as in CONSTANTS declarations or in CASE statements with constant expressions.
  
  
  Explanation:
  In ABAP, a constant is a value that does not change during program execution and is known at compile time. Examples include literals like 'X', 100, or predefined constants declared with the CONSTANTS keyword.
  If you try to assign a variable or an expression that depends on runtime values to a