Range selection for Fix value variable in BPS

Hi,

When create vaiable, there is a fix value variable, under selection condition, we can choose either multiple single value or range, however if we choose the range, let say mtareial number from 1 to 100, when we run the BPS application through UPSPL, the value for material variable will be populated with value 1 to 100, when I try to change the value to a single value,it's not allowed me to change, while the user define value type, we can change the value, Is this supposed to be?