Although an inputfield should work with any value (in QlikView there are only two types of values: numerics and literals) I do not recommend using it for several reasons, being performance the first of them.
By the way, what do you mean is not working?
- Is it not allowing to add the value you want to?
- Are you using it in a table box or a listbox or in a chart?
- Have you specified in the script that the field is going to be used as INPUTFIELD?
- Does it work in QlikView Desktop but it doesn't in Ajax?
Hope that helps.