How To Fix W8149 - Function only allowed for data type CHAR (not for data type &)

W8149 - Overview

• Message type: E = Error

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

• Message number: 149

• Message text: Function only allowed for data type CHAR (not for data type &)

What causes this issue?

A restriction, for which a concrete value is to be stated, can only be
established for character-based fields, because of conversion problems.

System Response

The input of values for non-character-based fields is rejected.

How to fix this error?

You can only check fields which are not character-based for general
value change (value = *).

Error message extract from SAP system. Copyright SAP SE.

W8149 - Details

• Certainly! Here's a detailed explanation for the SAP error message:
  
  SAP Error Message:
  W8149 Function only allowed for data type CHAR (not for data type &)
  
  
  Cause:
  This warning occurs when a function or operation that is designed to work only with data of type CHAR (character string) is applied to a variable or field of a different data type, such as NUMC, STRING, INT, or any other non-CHAR data type.
  For example, certain string functions like CONDENSE, SHIFT, REPLACE, or operations that expect a fixed-length character field cannot be used directly on data types like STRING (variable length), NUMC (numeric text), or numeric types.
  
  Typical Scenario:
  
  You have a variable declared as STRING or NUMC or some other type.
  You try to use a function or statement that only accepts CHAR type.
  The system raises this warning to indicate a type mismatch.
  
  
  
  Solution:
  
  
  Check the data type of the variable you are applying the function to.
  
  
  Convert the variable to CHAR