4215 Panel 1 x 4 x 3 (Undetermined Type) Parts: Panel Marked for Deletion
It's the undetermined entry and all PCC's are already known under the
variants.
TLG data still shows old PCC's and part 4215 in set inventories of today.
At least we can prevent that the undetermined version doesn't turn up in
new inventories. It's still possible to add them, although it's marked
for deletion.
Besides that I noticed that a lot of PCC's are added to both 4215a ánd 4215b
version.