Which of the following factors can cause challenges in inventory management?

Return-to-stock (RTS) prescriptions can indeed create significant challenges in inventory management. When medications are returned to inventory, it can lead to discrepancies between the actual stock on hand and the inventory system. This discrepancy can complicate tracking and forecasting, as it is often difficult to determine the usability and the condition of the returned medications. Additionally, RTS prescriptions may result in overstock of certain items if they are frequently returned, potentially leading to wastage or expiration of medications.

Conversely, while stock sale promotions, inactive inventory lists, and employee discounts can all impact inventory, they do not typically introduce the same level of direct operational challenges as RTS prescriptions. Stock sale promotions may temporarily affect inventory levels but are generally a planned, strategic approach. Inactive inventory lists can indicate overstock or items that need to be removed but do not directly cause an immediate issue in managing active stock. Employee discounts can incentivize staff purchases but usually do not have the same implications as handling prescriptions that are returned to stock.