How To Fix 28018 - You must enter parentheses in expressions with operator &1

SAP Error Message - Details

• Message type: E = Error

• Message class: 28 - Configuration

• Message number: 018

• Message text: You must enter parentheses in expressions with operator &1

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message 28018 - You must enter parentheses in expressions with operator &1 ?

  The SAP error message 28018, which states "You must enter parentheses in expressions with operator &1," typically occurs in ABAP programming when there is an issue with the syntax of an expression involving logical or arithmetic operators. This error indicates that the expression is ambiguous and requires parentheses to clarify the order of operations.
  Cause:
  The error is caused by the use of operators in an expression without the necessary parentheses to define the order of evaluation. For example, if you have an expression like A + B * C, the system may not know whether to evaluate A + B first or B * C first, leading to ambiguity.
  Solution:
  To resolve this error, you need to modify the expression by adding parentheses to clearly define the order of operations. Here are some examples:
  
  
  Original Expression:
  result = A + B * C.
  
  
  Corrected Expression:
  result = A + (B * C).  " If you want to multiply B and C first
  or
  result = (A + B) * C.  " If you want to add A and B first
  
  
  Related Information:
  
  Operators: The error message will specify which operator is causing the issue (e.g., +, -, *, /, AND, OR, etc.). Make sure to check the operator mentioned in the error message.
  ABAP Syntax: Familiarize yourself with ABAP syntax rules regarding operator precedence and associativity. This will help you avoid similar issues in the future.
  Debugging: If you encounter this error while debugging, check the expressions in the relevant code sections and ensure that all complex expressions are properly parenthesized.
  
  By following these guidelines, you should be able to resolve the error and ensure that your ABAP code executes as intended.