Before work on glass specification variants, parts manager and service technician should name the reviewer and closure owner. Link glass specification variants to part number, applicable VIN, batch, and bin in the acceptance sheet rather than using only a model or project name. The glass specification check starts with the parts catalog, package label, stock ledger, and issue record, then compares the electronic catalog, package label, and physical specification. Quarantine the batch when the glass specification does not match the part or the source is unclear, and issue it to the workshop only after supersession is confirmed. Before closing glass specification variants, review the corresponding import checklist. After a change, reopen only the record for glass specification variants and preserve approved decisions on other service-parts operations items.