Based on my experience never heard about the CS integration with WM however the business process you mentioned is quite possible.
if i look the flow of production order then system create a reservation number against the production order with all the detail (storage type and bin from control cycle) and at the time of consumption it picks the storage type / bin from the reservation table
when you create CS service order (IW32) could you please check whether there is any entry in the reservation table(RESB) for that or not