How do I unpack a LPN in same subinventory and same locator?

Summary: The relevant advanced inventory documentation states: "LPN Unpack - Unpacks packed material at a location into loose material, after ensuring that the corresponding subinventory and locator have an LPN setup for both packed and loose items." However, I was unable to perform an UNPACK operation for an LPN within the same subinventory and locator.
How can both packed and loose inventory coexist within the same locator?

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