you have to be creative with the triggers.
since the search only uses one form element, set the to trigger on that form element.
On the results page, go to the binding panel and click the plus button, select Form Data.
In the form data wizard click the folder icon an select the search page.
this will create a binding group for the form from the search page on the results page.
Now in the data assist search wizard, click the lightning bolt next to the trigger selection and select the S_BomReference form element from the search page.