As of release 3.0, a report has been provided that evaluates fixed storage bins.
The stock situation of the storage bins is taken into consideration, as well as existing fixed storage bin allocations ( Material -> Storage bin). The report also gives you the option of listing all storage bins with multiple fixed storage bin allocation for warehouses without mixed storage.
To call up the report select Master data -> Storage bin -> Evaluations -> Fixed storage bins from the Warehouse Management menu.