I had seen the error Data Type mismatch in Criteria Express. This happens if you hare giving string value as Criteria Express where Number is expected. Can you please share the database. Also let me know what field is expected on this control, it says "Product Line". What version of MS Access is it ? I assume the criteria express might be using some value of the same bound form for condition. If not, all the rows will have same output or result. Anyway, please share database , I guess it should be simple quick fix in few minutes after I receive the database.
I live in India, my time zone is GMT+5:30, let me know your time zone. I am online between 10 morning through 22 in the night India Time. Let me know.