Hi Sofie,
In the majority of the implementations I see that Business Content InfoProviders are never used directly. Instead a copy is made to an object in the customer namespace (i.e. prefix A* - Z*). I consider that as the best practice. Which namespace and naming convention is dependent on the (enterprise) data warehouse architecture and naming convention standards.
You can even go a step further by using custom InfoObjects. In this context please have a look at my blog Generating Reporting InfoObjects based on Business Content - Part 1: Introduction. Here I present an alternative approach for using Business Content InfoObjects directly.
Best regards,
Sander