Hi Jamie
I just got reply from Jennifer Cha :
This will not work in trial account. It will only work on the production account. However, there is a way to achieve this. My colleague is going to publishing a blog soon to resolve this issue. Let me check with him when the blog will be available.
Later she pointed out to : Accessing HANA XS OData in Web IDE and beyond
will let you know it goes...
thanks
Prahalad