It's been a while, but I saw the area where they pick the parts for these orders at the Zirndorf factory in 2014. The parts are in little boxes on long shelves in giant multi-story rotating racks. The boxes are marked with the ETN (part number) but it could be fairly easy for similar parts near each other to get mixed up. The pick sheet includes a part name but those are not super descriptive as anyone who has seen a parts invoice is aware.
