Expired Lots

This is from the user guide. Not understanding that last bullet? What is the logic behind being able to transact an expired lot?

You can assign lot control shelf life days, or enter a lot expiration date to determine when a lot expires. The expiration date controls the availability of the lot for transacting and planning purposes. An expired lot:

• Is not considered as on-hand supply when you are performing min-max, reorder point, or MRP planning calculations

• Cannot be reserved for a date beyond the expiration date

• Can be transacted and is included in on-hand quantities

Thanks in advance!