Shift+Backspace undesired data

Using Putty as the ssh terminal emulator for Redhat and when operators hold down the Shift key along with Backspace it brings in unprintable characters and corrupts the data file. I have tried keyboard mapping in Putty but can't seem to make Shift+Backspace just act like Backspace. Adis has the setting for Backspace but not Shift+Backspace. Anyone have any experience dealing with this or a suggestion on how to avoid the unprintable characters being returned into either numeric or alphanumeric fields. Thank you.