EXPONENT VALUE BEING DISPALYED.

i have defined a percentage (type F-because i want all the decimals so that sum of all percentages add up to 100 else it comes to 99.99 0r 100.01 etc) field in my internal table .Now passing this same table for alv_grid display.I dont want the exponent appearing i want the full number with all its decimals so that alll the percentages add up to 100.Three is an "exponent" option in fieldcatalog i have tried giving 0 to it, but hasnt worked.Any help