Removing Lots received as "Other"

We recently has a user mistakenly enter a purchase order for an incorrect part number (as in the part number didn’t actually exist in the system yet) and receive several lots against this PO. This resulted in some PUR-UKN transactions. Now I’m trying to clean this up and remove these lots from the system so we can receive them correctly but nothing I’ve tried will allow me to get rid of them. Does anyone know of a way to remove these?