Setting a field to null value in 4.6xx - A4000004 - 23 Nov 1999
In version 4.6xx it is difficult to set an input character field to have the
null value, once it has had some other value.
In release 4.5xx you can do this by simply pressing the "null input"
key when the field gets focus before pressing any other keys. However this
technique does not work in 4.6xx character fields , because if a field already
contains a value, in 4.6xx pressing any alphanumeric type key will actually
cause a series of delete keys to be sent to the application first, to remove
the highlighted existing value of the field, and only then is the entered
keystroke processed to become the value of the first character of the field,
and the null input key will instead be interpreted as a normal character.
To change a field to have the null value you have to do the following things in
order.
-
Blank the field, by pressing Del or Space
-
Move the focus to one of the other fields or buttons in the dialog (using the
mouse or cursor keys), then move it back again.
-
Now press the null input key to set the field to null. The focus should
immediately move to the next field in the dialog.
It has not yet been decided whether we will fix this problem in a future
release.