Final answer:
Duplicate serial numbers should never be used in the Requisition/Optar log as it can lead to errors and confusion in inventory tracking.
Step-by-step explanation:
Duplicate serial numbers should never be used in the Requisition/Optar log.
This is because duplicate serial numbers can lead to errors and confusion in tracking inventory. Each item should have a unique serial number to ensure accurate record-keeping.
Using duplicate serial numbers could result in inaccurate reporting, financial discrepancies, and difficulty in identifying specific items.