Final answer:
Inbound cargo personnel must use the Receipt Processing screen in ILS-S to process an unserviceable receipt, following specific steps to document and track the unserviceable items.
Step-by-step explanation:
When processing an unserviceable receipt in ILS-S, which stands for Integrated Logistics System - Supply, the processing screen that inbound cargo personnel must use is known as the Receipt Processing screen or module specific to handling unserviceable items.
This screen is essential for the proper documentation and tracking of items that are not fit for use.
Personnel would typically follow a series of steps, which often include identifying the item, marking it as unserviceable, documenting any relevant details or defects, and ensuring it is segregated from serviceable inventory.