Which document triggers the reduction of an asset master data's Net Book Value to zero?

You manufacture olive oil. You want to track the expiration date for the bottles of oil that you produce.
What is the best way to enable this?

You sell a case of several hardware tools as a kit. Often when selling the kit, one or more tools are replaced with other items from inventory. Which type of bill of materials would you create for the kit to support this process?

How are defined inventory levels (such as minimum inventory requirements) considered when running the Material Requirements Planning (MRP) wizard?

In the header of the item master data record for Item A2222, only the Purchasing Item checkbox is selected. The item category checkboxes for Inventory Item and for Sales Item are unchecked. Why would items have these settings?