Hi Alex
Please find the macro definitions for both the KF.
● Expiring Quantity
Displays the total quantity of stock or receipt elements in a bucket that are no longer usable from this bucket on.
● Projected Wastage Quantity
Displays the portion of the quantity displayed in key figure Expiration Quantity that needs to be discarded in the current demand situation.
As you can see below, in Projected Wastage Quantity it would also consider the demand requirement till the expiring date and provide you remaining quantity which could be strapped. Projected Wastage Quantity is more like dynamic KF which could change based on demand situation.
Please let us know if this information helps you.
Thanks
Amol