The item filter in the wanted list allows to select for "Wanted qty" but more
usefull would be a "Missing qty" filter or checkbox. I have many wanted lists
and some are 90% complete - but their parts still show up. I would like to have
a filter option to allow this feature: Show only parts where "Have Qty" is less
than "Wanted Qty" (Or the difference of "wanted" and "have" is greater x)