Mark,
Every data entry person in the world probably makes a hundred typing errors a day. Most are caught immediately and can be corrected by hitting the backspace key. Ctrl-0 erases all of the data in the field and is probably never used in most applications. Seems to me like trapping it is a good idea.
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>I'm not saying one shouldn't trap Ctrl+0; just that if this is a real problem, then the company needs to hire better data entry people. If they're pressing Ctrl+0 when they meant to press Shift+0, then they're probably pressing Shift+9 when they meant to press Shift+8, etc.