I have a situation where the freight amount was inputted for 16114.00 and when I go to reverse it there is not enough spaces available so it shows it as              -1611.40 how do I fix this?

Actually, there is a limit to how many digits the freight can be and the minus sign takes up one digit.  You will have to process a credit for a negative quantity of an actual line item for freight adjustment - use a type N part that will post to the freight account.