Usage in Inventory Management

Hi All,

Can anyone explain in detail with an example about Usage in Inventory Management？

SAP Library explain that There are two different types of usage in Inventory Management: unplanned and planned usage. The planned usage is updated when material is taken from the warehouse as a result of a reservation. Unplanned usage is updated when material is taken without a reservation being on hand.

Disbursements,are defined as shipments, transfers out, issues, consumption, etc. Disbursements should not include adjustments or other transactions unrelated to the purpose of the inventory and do not include movement of inventory between remote warehouses and the plant.

Are these two concept equivalence ?

Thank you very much!