The value of the left operand cannot be determined

Hi,

After the delete of TRIP, the condition does not

know how if the Object exist or not.

<b>

"Operator 'EQ': The value of the left operand cannot be determined

Error when determining attribute 'APPROVAL' of object instance '[BO.BUS2089.000054580000000062]'

Error in the evaluation of expression '&Trip<???>.Approval&' for item '5'

Operator 'EQ': The value of the left operand cannot be determined"</b>

the condition evaluates like this

<b>&TRIP.APPROVAL& EX and &TRIP.APPROVAL& =4</b>

do i have to check it before this that if the Entry has been deleted or not and then go for this condition

or

Is there any way to avoid this error.

Thank you,

Regards,

Boobalan