Sample Null Query
To identify all locations for your company that have no work centers associated with them, use a query like this:
- Open the Locations form.
 - Press .
 - On the Additional Criteria tab, in the three query criteria fields: 
           
- From the first list, select WC (for "Work Center").
 - From the operator list, select = (Equals).
 - In the adjacent value field, specify null.
 
 - Click .
 - Click . 
           
All records that meet the specified criteria are retrieved and displayed in the Results grid.
 - To return these records to the parent multiview form (Locations), click .
 - When prompted for confirmation, click .
 
          Note:  When you click , the system returns all retrieved records to the parent form, replacing whatever was previously displayed in that form. You cannot pick and choose which records to return.