What must be set up to allow the system to automatically propose specific accounts for non-stock materials?

To enable the system to automatically propose specific accounts for non-stock materials, it is essential to assign valuation classes to the material groups. Valuation classes are used to group similar materials based on their valuation and accounting treatment, which allows the system to determine the correct general ledger accounts during postings related to those materials.

When valuation classes are properly assigned to material groups, the system can automatically derive the appropriate accounts for transactions involving non-stock materials, such as costs incurred during procurement processes. This setup is critical for ensuring accurate financial reporting and compliance with accounting standards, as it directly links material management with the financial accounting aspects of the system.

The other options focus on different areas of system configuration that, while relevant to other functionalities, do not specifically address the assignment of accounts for non-stock materials. Therefore, option A stands out as the correct choice for managing the account determination process in this context.