What must be ensured about item codes when adding new inventory items?

When adding new inventory items, it is essential to ensure that item codes are unique to make searching easier. Unique item codes allow users to quickly locate and manage inventory items within the system without confusion. If duplicates were allowed, it would create complications in tracking and accounting for inventory, potentially leading to errors in stock levels and reporting. A distinct item code system streamlines processes like purchasing, selling, and inventory management by providing clarity and efficiency.

The other options suggest practices that could lead to inefficiencies or confusion. For instance, allowing duplicate item codes would hinder the ability to distinguish between different products effectively. While they might seem convenient under certain circumstances, untracked items typically have varying requirements for categorization, and using numerical only codes can limit the possibilities for item identification and may not suit all business needs.