In user define value setup , Auto Refresh By field is not appearing

Hi experts

i had created a FMS Query

when am trying to attach the query and assigning Auto refresh option, the By Field is not appering

what will be the cause ?

the below given is my query

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Select isnull(OHEM.firstName,'')+'  ' +isnull(OHEM.middleName,'')

+ ' '+isnull(OHEM.lastName,'')AS [Employee Name]

from ohem where U_EMPOLD_ID =   $[$-3.U_EMPFILENO]

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Regards