Our company plans to set some items to capture expiration dates upon receipt. However, these items are frequently used, and it’s impossible to wait until the inventory is exhausted before replenishing. In other words, there is always an on-hand quantity in stock. I noticed that when I try to modify the lot serial class, items that are in use (which should mean having an on-hand quantity) do not allow me to switch from the default class to the expiration date track class.

How can this problem be solved? What is the best approach. Please advise.