Which transaction would cause an increase to the balance of a revenue account?

The sales price list is based on the purchase price list with a factor of 1.5. A range of items in the sales price list were repriced using the Prices Update Wizard. Later, when the purchase price for one of these items changed, the item's price in the sales price list was NOT updated according to the factor.What could be the reason?

What condition must be fulfilled before the system recommends issuing a level 2 dunning letter?

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?

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?