How To Fix 28031 - Comparison operator required

SAP Error Message - Details

• Message type: E = Error

• Message class: 28 - Configuration

• Message number: 031

• Message text: Comparison operator required

What causes this issue?

The syntax check found an error. The system expects a numeric
comparison operator at the cursor (such as '=', '<>', '<', '>', or '<='
or '>=').

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?

Check the expression at the cursor. You may need to correct the
operator or check the other messages to find the cause of the error.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message 28031 - Comparison operator required ?

  The SAP error message 28031, "Comparison operator required," typically occurs in ABAP programming when a comparison operation is expected but not provided. This error can arise in various contexts, such as when using conditional statements, loops, or database queries.
  Cause:
  The error is usually caused by one of the following issues:
  
  Missing Comparison Operator: In a conditional statement (like IF, WHILE, etc.), a comparison operator (like =, <>, <, >, <=, >=) is missing.
  Incorrect Syntax: The syntax of the statement is incorrect, leading to the parser expecting a comparison operator.
  Improper Use of Variables: Using variables that are not properly defined or initialized can also lead to this error.
  
  Solution:
  To resolve the error, you can take the following steps:
  
  
  Check Conditional Statements: Review the conditional statements in your code to ensure that all necessary comparison operators are included. For example:
  IF variable1 = variable2.  " Correct usage
  IF variable1 variable2.    " Incorrect usage, missing operator
  
  
  Review Syntax: Ensure that the syntax of your statements is correct. Refer to the ABAP documentation for the correct syntax of the statements you are using.
  
  
  Variable Initialization: Make sure that all variables used in comparisons are properly initialized and defined. Uninitialized variables can lead to unexpected behavior.
  
  
  Debugging: Use the ABAP debugger to step through your code and identify where the error occurs. This can help you pinpoint the exact line causing the issue.
  
  
  Consult Documentation: If you are unsure about the syntax or usage of a specific function or statement, refer to the official SAP documentation or ABAP programming guidelines.
  
  
  Related Information:
  
  ABAP Documentation: SAP provides extensive documentation on ABAP programming, including syntax and examples for conditional statements and operators.
  SAP Community: The SAP Community forums can be a valuable resource for finding solutions to specific errors and sharing experiences with other developers.
  Error Handling: Implement proper error handling in your ABAP programs to catch and manage errors gracefully.
  
  By following these steps, you should be able to identify and fix the cause of the SAP error message 28031.