Prior to the existence of HUM, in WM you had storage units (SUs) and in SD shipping units (also SUs). HUM is more or less an extension of the functionality of these through the other modules in the supply chain. I believe when SAP did this they neede
SAP HUM 基于HU的盘点 See the menu of HU physical inventory, HUINV01 to create physical inventory document, Execute, Save it, HUINV02 to Print Physical Inventory Document Print it, Enter, SP02 to see the print result, 3)HUINV03