All QMF input fields allow DBCS data if you are using a DBCS display terminal.
Your keyboard can lock while you are keying DBCS data. This indicates that you might not have allowed for the SI character at the end of a field (or line in the Show Field window of the Table Editor). If this happens, press the Reset key on your keyboard and then press Enter to continue. In the Show Field window of the Table Editor and on SQL query and procedure panels, the SI/SO and SI/blank/SO characters are stripped out each time you press Enter. This means that you might have extra space in these input fields after you press Enter.