This might be a little more involved that it seems. One work around that I can think of would be to refer to a particular column when you are setting up the DataAssist Search server behavior, then after the fact go into the DataAssist Search code that is written to the page and update the name of the column you selected to the name it is set to in your recordset.
If you can post back with a page that has the search on it and let us know the column you have selected and what you would like it to be I can show you how this change would be made.