Hi Jurgen,
I am not sure - I am only a business user at a company that has only been using SAP for about 5 years. We don't have a lot of knowledge or experience and are still "finding our way." It is, for someone that is not an expert, very difficult to find out the functionality of different SAP modules and products.
Luckily, we have helpful community members like you to point us in the right direction. :-)
I will try to learn more about Warehouse Management and see if I can make a proposal here internally to use it.
Thanks much,
Timothy