Which procedure must be defined to require users to enter an order reason for sales orders?

To ensure users are required to enter an order reason for sales orders, it is essential to define an incompletion procedure and specifically mark the order reason field as mandatory. This approach directly addresses the need for capturing vital information that can affect sales order processing.

The incompletion procedure serves a critical role in identifying which fields must be filled out before an order can proceed in the system. By marking the order reason field as mandatory, the system will prompt users to provide a justification or explanation whenever a sales order is created or modified, ensuring that this important information is consistently tracked and available for reporting and analysis.

In contrast, other options relate to different aspects of managing sales order processing but do not achieve the goal of making the order reason mandatory. Assigning a status group, for example, may categorize documents but does not compel users to input specific information. Similarly, setting a status to "released for further process steps" or simply assigning an incompletion procedure to a sales document type without focusing on the mandatory requirement would not enforce the entry of the order reason as required. Hence, the correct choice clearly outlines the necessary action to achieve the desired outcome in data entry for sales orders.