Which partner-related procedure must be enhanced to include a new function for the sales document type?

The partner determination procedure is the correct choice because it defines how partners are assigned to sales documents, such as sales orders or quotations. When a new function is added to a specific sales document type, it may require alterations in how partners are determined and processed for that document type.

This procedure allows the system to identify, determine, and assign the necessary partners (like sold-to, ship-to, bill-to, and payer) based on various criteria related to the sales document. Enhancing this procedure is crucial to ensure that the new function recognizes and appropriately processes the partner data connected to that sales document type.

The other options relate to different aspects of the sales process. The pricing procedure, for instance, is focused on how prices are determined for transactions, and while important, it is not directly involved in partner assignment. Similarly, a condition record pertains to specific data regarding pricing, discounts, or conditions under which prices are applied, but it does not affect partner assignment itself. The order confirmation process deals with how confirmations for orders are handled, which is again not related to determining or enhancing partner assignments. Hence, the partner determination procedure is the specific area that requires enhancement to include new functionality related to partners for the sales document type.