What SELECT statement would correctly define an ABAP Core Data Services (CDS) view that totals the NET_AMOUNT column for each sales order?

The correct choice is the one that effectively groups the data by the sales order ID while aggregating the total of the NET_AMOUNT column. In this case, the proper use of aggregation functions such as sum() requires a corresponding group by clause that specifies the qualifier for the aggregation.

When defining a CDS view, the SELECT statement must include a GROUP BY clause for the fields that are not aggregated (in this case, so_id). This allows for the sum(net_amount) to be calculated for each distinct sales order ID. By grouping on so_id, the database can compute the total net amount associated with each specific order rather than treating all rows as a single group, which would lead to incorrect results if you need to differentiate between multiple sales orders.

This approach ensures that the final output includes each sales order ID alongside its respective total of the NET_AMOUNT, enabling comprehensive analysis of sales order performance.

In contrast, options that attempt to group by NET_AMOUNT or do not include a GROUP BY clause entirely would lead to logical errors in processing, as these would either negate the intention of aggregating per sales order or produce misleading data across multiple sales orders without distinction.