No objects were selected

Hello all,

I am very new to SAP, just trying to learn it for work. We are using SAP ECC 6.0

I am trying to narrow down my search for notifications in IW29. When I restrict my search based on a date range I come up with 29 results. When I further try to narrow down the results by limiting the functional location (001-pro) it tells me that "No objects were selected". I know that there are 6 results in that range that should come up. What am I doing wrong?

Thanks