allow function key but no data entry

[ricksimm]

I have all cells in column A unlocked so I can select any one of those cells and allow for use of a function key I have defined. The problem is that all those cells contain valid data that I do not want the operator to change. I would actually like to keep them from typing anything in those cells and still allow for use of the function key. Hope I explained this sufficiently. Any suggestions? Thanks.