- Create a new purchase tax with 0 as amount (Tax 0%); - Create a new Bill, add a new line with the new Tax 0%; - Use the tax's widget to modify the tax amount. Before this commit, an error message was shown. Now, only taxes values bigger than zero can be modified with the widget. opw-2307761 X-original-commit: 03ee8036b3ea344372736beeefe6c4d74e4e62be