"Namespaces that should not be removed" doesn't work

We have a convention in my team to always specify the full name of types under a specific namespace (Engine.).  

So I've added the namespace in Options > Code Editing > C# > Namespace Imports: "Namespaces that should not be removed".

But this does not work. The namespace is always removed by Resharper whenever I refactor or do auto-completion.

For example, if I type:

List<Engine.MyClass> t = new

Resharper will propose adding new List<MyClass>() and will remove the namespace everywhere in the file and replace it with a using;

Any ideas how to prevent resharper from doing this?


Thanks
Anthony Brien