A labeling mistake is most expensive when found in production. The count looked perfect. Every location reconciled, zero variances on the sheet, team finished two hours ahead of schedule. Then three days later, production calls because the sub-assembly they pulled is 14mm, not 12mm, and they've already run four hundred units. Nobody flagged it because nobody saw it. The item was in the right bin, right quantity, right label on the outside of the carton. The problem was a sing