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

Procedure
Please choose the operator key &V1& again in PC mode of the operatingeditor. Expression 2 is deleted (provided that expression 1 has not yetbeen entered, expression 2 is moved to expression 1).
In the traditional mode, please delete the input field for expression2.