Shipping Charges

Hi All,



I have set up a global discount in my shipping options that allows for a 5% discount up to $100 and a 10% discount over $100.



How do I stop the shipping value being less that $0.



See example below 10 item(s) $399.50 Shipping $-21.55





Order Total$377.95

Any Ideas?



Thanks

Looks like a bug. Please post it to the bug tracker