Which configuration object must be maintained for each plant in SAP MM?

In SAP MM, maintaining plant parameters is essential because they define specific settings and criteria related to each plant's operations within the system. These parameters are crucial for areas such as inventory management, production, purchasing, and materials planning, tailoring the system functionalities to meet the unique requirements of each plant.

By configuring plant parameters, you can specify aspects such as the valuation area for materials, how inventory is managed, and various procurement settings applicable to that particular plant. This ensures that the system runs smoothly and supports the specific processes and policies of each location.

In contrast, the other options—account group, purchase organization, and storage location—serve different purposes and do not require maintenance at the plant-specific level. For instance, while account groups are related to the classification of master data, and purchase organizations are used for procurement activities, these are not tied directly to the specific settings and parameters that need to be set for each individual plant in the context of material management. Thus, plant parameters distinctly stand out as the critical configuration object needed for each plant in SAP MM.