If you add a check box or modify an input field to a check box field, then you will need to update the DataAssist Search Wizard as well. The DataAssist Search wizard is able to deals with check boxes however, it needs to be configured to work with check boxes. If you reenter the dataassist search wizard server behavior, you will change the Column Type to Number/Boolean and change the type to 'Check'.
Let me know if you still have any other questions.