How To Fix W8354 - Operator '&1' allows only one operand

W8354 - Overview

• Message type: E = Error

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

• Message number: 354

• Message text: Operator '&1' allows only one operand

What causes this issue?

The existence operators 'EX' and 'NX' only have one operand. The
operand must be entered as 'expression 1', that is, on the left side.
If a second operand occurs, 'expression 2', it must be deleted.

How to fix this error?

Please choose the operator key &V1& again in PC mode of the operating
editor. Expression 2 is deleted (provided that expression 1 has not yet
been entered, expression 2 is moved to expression 1).
In the traditional mode, please delete the input field for expression
2.

Error message extract from SAP system. Copyright SAP SE.

W8354 - Details

• Certainly! Here's a detailed explanation for the SAP error message W8354: Operator '&1' allows only one operand:
  
  Error Message
  W8354 Operator '&1' allows only one operand
  
  Cause
  This warning occurs when an operator that is designed to work with only one operand (unary operator) is used with more than one operand in an expression or condition.
  In SAP, certain operators expect exactly one operand. For example, the unary minus operator (-) or the logical NOT operator (NOT) are unary operators and should be applied to a single operand only.
  If you mistakenly use such an operator with multiple operands, or if the syntax of the expression is incorrect causing the parser to interpret multiple operands, this warning is triggered.
  
  Common Scenarios
  
  Using unary operators like - or NOT with multiple operands.
  Incorrect syntax in conditions or expressions in ABAP code, SAP Query, or other SAP tools.
  Misplaced parentheses or missing operators causing the parser to misinterpret the expression.
  
  
  Example
  DATA: lv_result TYPE