Coupon Issue

I am working on LS Retail (Navision 2009 ).

I want to create a coupon which will give discount of 5% on every article customer buys or on the total bill. I am trying to create a discount coupon but it not working(as it depends on no. of items to trigger). The values i am entering are-

Discount type as discount %.

Discount Value as 5.

Type Manufacturer Discount

Handling Discount

No of items to trigger -1

Affects Any Item Line

I can't enter 0 on no. of items as it says invalid coupon when i try to use it. I cant make it 100 as it then require 100 items in the bill.



Is there any solution so that it works the way i want to use it??

Thanks
Anik Datta