What is "Leave Days comply Regular Fraction"

When "Leave Days comply Regular Fraction" is check, the fraction part of  leave days enter in Leave Entry PLFLA should comply with:

 Leave Day Decimal Place  Possible Leave Days Value
 1     0.0, 0.5
 2     0.00, 0.25, 0.50, 0.75
 3     0.000, 0.125, 0.250, 0.375, 0.500, 0.625, 0.750, 0.875        
 4     0.0000, 0.0625, 0.1250, 0.1875, 0.2500, 0.3125, 0.3750, 0.4375, 0.5000, 0.5615, 0.6250, 0.6875, 0.7500, 0.8125, 0.8750, 0.9375