Why does engineering data fall apart between design and production?
Because each team keeps its own copy. Engineering has the drawing, the ERP has a part master, costing has a spreadsheet and the change process lives in email. The Engineering and PLM suite keeps parts, revisions, BOMs, changes and costs in one place, so every team reads the same released revision.
Each product handles one job. Together they carry a part from its first revision through every engineering change, with the BOM, the cost and the launch plan kept in step.