Explanation
To set up the Situation Handling use case for Quantity Deficit in Supplier's Delivery, you must use the Monitor Situations app and the Manage Situation Types app. The Monitor Situations app allows you to view and process situations that require your attention, such as delivery delays or quantity deficits. The Manage Situation Types app allows you to configure the settings and rules for different types of situations, such as defining the threshold values and actions for quantity deficit situations. References: SAP S/4HANA Sourcing and Procurement | SAP Learning, Course S4520, Unit 8, Lesson 1.