" / " Changing Decimal number format to Fraction on Protected Cell
 

I have a worksheet that has cells which are unprotected and then the
entire worksheet is protected. This is so users can input information
into the individual cells. My format options are grayed out, and
format _cells through the menu options is also grayed out. Therefore, I
am pretty sure that they are protected correctly. At the worksheet
level the Allow user to Change format is not checked. My problem is
that if a user accidentally hits the "/" when entering a number the
cell automatically changes a decimal number to a fraction format. This
permanently changed the format on this cell to a fraction from this
point on. Does anybody know how to prevent this from happening or how
can a user change the format back to a decimal number without
unprotecting the entire worksheet?