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

SAP Error Message - Details

• 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.