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Hello hengamesh, I am afraid Queries only work with the first column of a combo, so create an Unbound Field on your form, you can set it's "Visible" property to No if you want to hide it.
Then in the After Update event of the Combo add
me.fieldname = me.combo.Column(3)
before the Requery statement, where fieldname is the actual name of your unbound field. Now in your Query us the Unbound Field as the Criteria.