I have 2 warehouses and I need to manage the inventory per sku per warehouse. It looks like the api (since 7.5) supports this scenario http://world.episerver.com/documentation/Items/Developers-Guide/EPiServer-Commerce/75/Warehouses-and-inventories/Warehouses-and-inventories-examples/ but I in commerce manager I can only manage the inventory for only 1 warehouse per sku, is this correct? Is there a way to enable this or is it only possible by api and not in the ui?
Commerce Manager supports multiple inventories per sku perfectly:
In tab Warehouse Inventory, when you change the Warehouse dropdown list, you'll be able to update the inventory of the SKU in that warehouse.