However, MDTOFF is not currently supported to affect on-screen behaviour such as validity checking. For example, say a record RECORDA has a field FIELDA with both VALUES and DSPATR(MDT) specified. Before RECORDA is written to the screen, FIELDA is given a value that is not specified in its values keyword. Then RECORDA is written to the screen and the user must change the value of FIELDA to a value specified in its VALUES keyword or validity checking will fail if the user presses "Enter" or a command function key. However, if a record RECORDB with MDTOFF is written to the screen, it will clear the changed data tag set on FIELDA and the validity checking will be bypassed if the user presses "Enter" or a command function key. In WebFacing, we do not currently support these type of on-screen behaviour consequences of MDTOFF.