I have 2 comboboxes. When I click on a item in the first Combobox, it has to requery the second combobox. BUT I want the first item of the second combobox automatically in the field as default.

So that the user doesnt use that one. Other reason is because I want it invisible.

After the Requery then this code should do it:
Me.ComboName = Me.ComboName.ItemData(0)
...using your ComboBoxName of course.